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Several Abrams tanks that were irrecoverable due to loss of mobility or other circumstances were destroyed by friendly forces, usually by other Abrams tanks, to prevent their capture.
Some troops employed short-range anti-tank rockets and fired at the tracks, rear and top. Other tanks were put out of action by engine fires when flammable fuel stored externally in turret racks was hit by small arms fire and spilled into the engine compartment.
Vulnerabilities exposed during urban combat in the invasion of Iraq were addressed with the Tank Urban Survival Kit TUSK modifications, including armor upgrades and a gun shield, issued to some M1 Abrams tanks.
It added protection in the rear and side of the tank to improve fighting ability in urban environments.
In May , it was reported that a U. M1 tank had also been damaged in Iraq by insurgent fire of a Soviet-made RPG "Vampir", which uses a tandem-charge high explosive anti-tank warhead to penetrate explosive reactive armor ERA as well as composite armor behind it.
Between and the U. During three months, about one-third of the Iraqi Army's M1 tanks had been damaged or destroyed by ISIL and some were captured by opposing forces.
By December , the Iraqi Army only had about 40 operational Abrams left. That month, the U. Department of State approved the sale of another Abrams to Iraq.
Iranian-backed Iraqi Shiite Kata'ib Hezbollah Hezbollah Brigades reported to operate M1 Abrams, and released publicity showing the tanks being transported by trucks to take part in the battle of Mosul.
It is not known whether the tanks were captured from ISIS, seized from Iraq's military, or handed over. One Iraqi-operated Abrams has been nicknamed "The Beast" after it became the lone working tank when taking back the town of Hit in April , destroying enemy fighting positions and IED emplacements.
It was claimed by Kurdish commanders that at least one Abrams was destroyed by the Peshmerga. Tanks may have limited utility in Afghanistan due to the mountainous terrain, although Canada and Denmark have deployed Leopard 1 and 2 MBTs that have been specially modified to operate in the relatively flat and arid conditions of southwestern Afghanistan.
In late , at the request of Regional Command Southwest , the U. The U. General Dynamics Land Systems GDLS , which operates the factory, opposed the move, arguing that suspension of operations would increase long-term costs and reduce flexibility.
Congress and General Dynamics were criticized for redirecting money to keep production lines open and accused of "forcing the Army to buy tanks it didn't need.
They contended that the move was to upgrade Army National Guard units to expand a "pure fleet" and maintain production of identified "irreplaceable" subcomponents; a prolonged shutdown could cause their makers to lose their ability to produce them and foreign tank sales were not guaranteed to keep production lines open.
There is still risk of production gaps even with production extended through ; with funds awarded before recapitalization is needed, budgetary pressures may push planned new upgrades for the Abrams from to In , the new administration made rebuilding the military a priority.
It was reported in that the Army had ordered tanks re-built to new standards with employment at over workers and expected to rise to 1, Prototypes were made but the program was canceled.
Engineering Change Proposal 1 is a two-part upgrade process. ECP1A adds space, weight, and power improvements and active protection against improvised explosive devices.
ECP1B, which will begin development in , may include sensor upgrades and the convergence of several tank round capabilities into a multi-purpose round.
Army Vice Chief of Staff Gen. Army vehicles. However, the Army anticipates that the remaining M1A1 fleet will remain in U. The M1A3 Abrams was in the early design period with the U.
Army in At that time, the service was seeking a lighter tank version with the same protection as current versions.
It aimed to build prototypes by and begin fielding the first combat-ready M1A3s by Additionally an all new version for the U. Army has been in planning and development for several years.
Earlier U. The large white insignia stars have also transitioned to much smaller black markings. Some units painted their M1s with the older Mobility Equipment Research and Design Command MERDC 4-color paint scheme but the turn-in requirements for these tanks required repainting them to overall forest green.
Therefore, even though a large number of the base model M1s were camouflaged in the field, few or none exist today. Some, but not all, of these tanks were re-painted to their "authorized" paint scheme.
M1A2s built for Middle Eastern countries were painted in desert tan. Replacement parts roadwheels, armor skirt panels, drive sprockets, etc.
Australian M1A1s were desert tan when delivered but have undergone a transition to the Australian Army vehicle standard 'Disruptive Pattern Camouflage'; a scheme that consists of black, olive drab, and brown.
Army can equip its Abrams tanks with the Saab Barracuda camouflage system , which provides concealment against visual, infrared, thermal infrared, and broad-band radar detection.
The turret is fitted with two six-barreled M smoke grenade launchers USMC M1A1s use an eight-barreled version , with one on each side.
When deployed, the grenades airburst , creating a thick smoke that blocks both visual and thermal imaging.
The engine is also equipped with a smoke generator that is triggered by the driver. When activated, fuel is sprayed into the hot turbine exhaust, creating the thick smoke.
However, due to the change from diesel as a primary fuel to the use of JP-8 , this system is disabled on most Abrams tanks today because of a slightly elevated risk of fire damage to the engine compartment.
Baer to witness the progress of British developed Chobham armor. HEAT and sabot rounds enter the beginning layers of armor but are unable to penetrate the crew compartment.
Ceramics have the ability to absorb a great deal of heat, and can blunt physical blows by cracking and deflecting the force. The remaining hot gasses and metal shrapnel spread out or settle in empty air pockets.
Both contractors reevaluated their proposed armor configurations based upon the newly obtained data. This led to major changes in the General Motors XM1.
The most prominent of which is the turret front changing from vertical to sloped armor. The Chrysler XM1 on the other hand retained its basic shape although a number of changes were made.
The Ballistic Research Laboratory had to develop new armor combinations in order to accommodate the changes made by the contractors.
Similar to most other main battle tanks, the M1 Abrams feature composite armor only on the frontal aspect of the hull.
However, the Abrams' turret features composite armoring across both the front and the sides. In addition, the side skirts of the frontal half of the hull are also made of composite, providing superior ballistic protection against chemical energy munitions such as HEAT rounds.
The composition of the Abrams' composite armor consists of sandwiched plates of non-explosive reactive armor NERA between conventional steel plates.
The NERA plates feature elasticity, allowing them to flex and distort upon perforation, disrupting the penetrating jets of shaped charges and providing more material and space for a kinetic round to pass through, thus providing increased protection compared to conventional steel armor of similar weight.
For the base model M1 Abrams, Steven J. Armor protection was improved by implementing a new special armor incorporating depleted uranium and other undisclosed materials and layouts.
This new armor increased effective armor particularly against kinetic energy rounds  but at the expense of adding considerable weight to the tank, as depleted uranium is 1.
US-based tank battalions participating in Operation Desert Storm received an emergency program to upgrade their tanks with depleted uranium armor immediately before the onset of the campaign.
M1A2 tanks uniformly incorporate depleted uranium armor, and all M1A1 tanks in active service have been upgraded to this standard as well.
The M1A2 SEP variants have been equipped with third generation depleted uranium armor combined with a graphite coating. The M1A2C also features increased physical line-of-sight turret armor.
In , a program was begun to incorporate improved turret side armor into the M1A2. This was intended to offer better protection against rocket-propelled grenades more modern than the baseline RPG These kits were installed on about older M1A2 tanks in and it was also included in upgraded tanks.
The Abrams may also be fitted with explosive reactive armor over the track skirts if needed such as the Tank Urban Survival Kit  and slat armor over the rear of the tank and rear fuel cells to protect against ATGMs.
Protection against spalling is provided by a kevlar liner. The tank has a halon firefighting system to automatically extinguish fires in the crew compartment.
The engine compartment has a firefighting system that is engaged by pulling a T-handle located on the left side of the hull. The Halon gas can be dangerous to the crew.
The crew compartment also contains small hand-held fire extinguishers. Fuel and ammunition are stored in armored compartments with blowout panels to protect the crew from the risk of the tank's own ammunition cooking off exploding if the tank is damaged—the main gun's ammunition is stored in the rear section of the turret, with blast doors that open under power by sliding sideways only to remove a round for firing, then automatically close.
Doctrine mandates that the ammunition door must be closed before arming the main gun. A tank's front armor is much stronger than that on the sides, top, or rear.
In an urban environment, attacks can come from any direction, and attackers can get close enough to reliably hit weak points in the tank's armor or gain sufficient elevation to hit the top armor.
Armor upgrades include reactive armor on the sides of the tank and slat armor similar to that on the Stryker on the rear to protect against rocket-propelled grenades and other shaped charge warheads.
An exterior telephone allows supporting infantry to communicate with the tank commander. The TUSK system is a field-installable kit that allows tanks to be upgraded without needing to be recalled to a maintenance depot.
While the reactive armor may not be needed in most situations, like those present in maneuver warfare , items like the rear slat armor, loader's gun shield, infantry phone which saw use on Marine Corps M1A1s as early as , and Kongsberg Remote Weapons Station for the Deliveries were expected to be completed by April On 8 December , the U.
However, the drawback to the system is that the ATGM is not destroyed, it is merely directed away from its intended target, leaving the missile to detonate elsewhere.
This device is mounted on the turret roof in front of the loader's hatch, and can lead some people to mistake Abrams tanks fitted with these devices for the M1A2 version, since the Commander's Independent Thermal Viewer on the latter is mounted in the same place, though the MCD is box-shaped and fixed in place as opposed to cylindrical and rotating like the CITV.
In , the U. This gun used a license-made tube of the British Royal Ordnance L7 gun together with the vertical sliding breech block and other parts of the U.
TE2 prototype gun. However, it proved to be inadequate; a cannon with lethality beyond the 1. To attain that lethality, the projectile diameter needed to be increased.
Due to the increased calibre, only 40 or 42 rounds are able to be stored depending on if the tank is an A1 or A2 model. The MA1 fires a variety of rounds.
MA1, known as the "Silver Bullet", saw widespread service in the Gulf War, where it proved itself against Iraqi armor such as the T The Abrams uses a manual loader.
The tungsten balls can be used to clear enemy dismounts, break up hasty ambush sites in urban areas, clear defiles , stop infantry attacks and counter-attacks and support friendly infantry assaults by providing covering fire.
It is designed to destroy obstacles and barriers. The round is a modified MA1 with the front fuse replaced by a steel nose to penetrate into the obstacle before detonation.
Army Research Laboratory ARL conducted a thermal analysis of the M from to to evaluate the potential of using a hybrid barrel system that would allow for multiple weapon systems such as the XM Mid- Range munition, airburst rounds, or XM The test concluded that mesh density number of elements per unit area impacts accuracy of the M and specific densities would be needed for each weapon system.
Called the Advanced Multi-Purpose AMP round, it will have point detonation, delay, and airburst modes through an ammunition data-link and a multi-mode, programmable fuse in a single munition.
Having one round that does the job of four would simplify logistics and be able to be used on a variety of targets.
The AMP is to be effective against bunkers, infantry, light armor, and obstacles out to meters, and will be able to breach reinforced concrete walls and defeat ATGM teams from to 2, meters.
The XM was a guided munition using a dual-mode seeker that combined imaging-infrared and semi-active laser guidance.
The CE variant was chosen due to its better effects against secondary targets, providing a more versatile weapon. The Abrams tank has three machine guns , with an optional fourth:.
The Abrams is equipped with a ballistic fire-control computer that uses user and system-supplied data from a variety of sources to compute, display, and incorporate the three components of a ballistic solution—lead angle, ammunition type, and range to the target—to accurately fire the main gun.
These three components are determined using a laser rangefinder , crosswind sensor, a pendulum static cant sensor, data concerning performance and flight characteristics of each specific type of round, tank-specific boresight alignment data, ammunition temperature, air temperature, barometric pressure, a muzzle reference system MRS that determines and compensates for barrel drop at the muzzle due to gravitational pull and barrel heating due to firing or sunlight, and target speed determined by tracking rate tachometers in the Gunner's or Commander's Controls Handles.
All of these factors are computed into a ballistic solution and updated 30 times per second. The updated solution is displayed in the Gunner's or Tank Commander's field of view in the form of a reticle in both day and Thermal modes.
The ballistic computer manipulates the turret and a complex arrangement of mirrors so that all one has to do is keep the reticle on the target and fire to achieve a hit.
Proper lead and gun tube elevation are applied to the turret by the computer, greatly simplifying the job of the gunner. The fire-control system uses this data to compute a firing solution for the gunner.
Additionally, the Commander's Independent Thermal Viewer CITV on the M1A2 can be used to locate targets and pass them on for the gunner to engage while the commander scans for new targets.
In the event of a malfunction or damage to the primary sight system, the main and coaxial weapons can be manually aimed using a telescopic scope boresighted to the main gun known as the Gunner's Auxiliary Sight GAS.
Turret traverse and main gun elevation can be accomplished with manual handles and cranks in the event of a Fire Control System or Hydraulic System failure.
The commander's M2HB. The loader's M machine gun is aimed either with the built-in iron sights or with a thermal scope mounted on the machine gun.
Preliminary testing showed the upgrades reduced target engagement time from six seconds to three by allowing the commander and gunner to work more closely and collaborate better on target acquisition.
The tank was built around this engine  and it is multifuel—capable, including diesel , kerosene , any grade of motor gasoline , and jet fuel such as JP-4 or JP For logistical reasons, JP-8 is the U.
Honeywell was developing another gas turbine engine with General Electric for the XM Crusader program that was to be a replacement for the Abrams's AGT engine.
General Dynamics has been working on a drop-in diesel engine to replace the gas turbine engine. The engine represents advancements in diesel engine design since the Abrams was first designed, including a common rail fuel injector system where fuel is pressurized and atomized in the cylinder rather than mechanically sprayed.
It also has greater torque, an altered nuclear, biological, and chemical protection system that operates independently of the engine, uses less fuel while idle, is quieter, and gives off significantly less heat and pollutants.
The tracks are a version of the Leopard 2's tracks with different rubber pads and a larger center guide.
The improved engine and tracks are not part of an Army upgrade program, but may be included in a near-term engineering change proposal ECP phase.
The new APU will also be more fuel efficient than the tank's main engine. Although the M1 tank is not designed to carry riders easily, provisions exist for the Abrams to transport troops in tank desant with the turret stabilization device switched off.
A battle equipped infantry squad may ride on the rear of the tank, behind the turret. The soldiers can use ropes and equipment straps to provide handholds and snap links to secure themselves.
If and when enemy contact is made, the tank conceals itself allowing the infantry to dismount. Strategic mobility is the ability of the tanks of an armed force to arrive in a timely, cost effective, and synchronized fashion.
The limited capacity two combat-ready tanks in a C-5, one combat-ready tank in a C caused serious logistical problems when deploying the tanks for the first Persian Gulf War, though there was enough time for 1, tanks to be transported by ship.
The HETS can operate on highways, secondary roads, and cross-country. It accommodates the four tank crew members. The first instance of the Abrams being airlifted directly into a battlefield occurred in October From Wikipedia, the free encyclopedia.
For the early 20th Century light tank, see M1 Combat Car. Current U. Type of Main battle tank. Tanks of the United States. Cold War tanks.
List Category. Main article: History of the M1 Abrams. Main article: MBT This section needs to be updated. Please update this article to reflect recent events or newly available information.
January Further information: Military camouflage. Play media. Archived from the original on 25 September Retrieved 30 June Archived from the original on 3 November Retrieved 20 February Archived from the original on 13 December Retrieved 12 December Archived PDF from the original on 19 October Retrieved 19 October United States Army.
Archived from the original on 15 November Retrieved 16 November Jane's Armour and Artillery — Jane's Information Group. This was the source of his success.
Between and he built and ran Europe's first, and for a long time only, crust wheel foundry. Because of the large number of orders his foundry proved to be too small, so he built a new factory in Between and his company delivered 86, wheels to 59 railway companies.
Ganz also bought an English patent, the invention of Ransomes and Biddel, which concerned parts for rail switches. He improved this also, and got two patents in and in Between and , his company delivered 6, crust cast rail switch parts to railway companies.
The company did not only produce parts for railways. They also made parts for bridges e. The number of employees at Ganz Works was 60 in , in and in The products of the company obtained international recognition: at the World's Fairs in Paris three bronze medals Exposition Universelle , in London bronze medaile International Exhibition and, at the Swiss Industrywork Exhibition, a silver medal in They could not have their own children, so they adopted two related orphan girls, Anna Pospech and Jozefina Ganz.
He was nominated honorary citizen of Buda by the city council on 4 September On the 23 November they celebrated the production of the hundredth wheel, made by chill casting , and Ganz gave a dinner for all his employees and their families.
During his life he spent a lot of money for social purposes. In his company he uniquely opened a retirement fund and a patient fund.
He kept his Swiss citizenship. There is no evidence that he learned or could speak any Hungarian. He spoke with his family in German , and the employees of his factory spoke with him in German also.
In his last years he worked a lot, but was not happy with his life. He saw all his brothers going crazy and he was convinced that he would have the same future.
After the death of his widow in , they both lie there forever. He is considered to be one of the pioneers of Hungarian heavy industry. With his works he contributed a lot to the development of the Hungarian casting and machine manufacturing industry.
Foundry and Machine Manufacturing Inc. It was active in the machine, vehicle and electrical manufacturing industries with world-famous inventions and technical solutions.
Despite strong funding and four seasons of broadcasts on TNN, the venture never became a "live" attraction.
Fabricated storylines and characters in the mode of professional wrestling were being featured more than actual competitive skating around season 3 and 4, raising the ire of many skaters and fans of true roller derby.
Games were played in four 6-minute periods with as many second jams as possible; women skated odd numbered periods, and the men skated the even-numbered periods.
In traditional roller derby, the game has eight minute periods, again with second jams. Jams began and ended on the referee's whistle, and a buzzer sounded to reinforce this.
Whereas traditional derby employs a pivot skater, RollerJam did not use one. Instead, each team had three blockers, each wearing a white helmet, and two jammers, each wearing a black helmet with red stripes.
In-line skates were legalized in attempt to modernize the sport, but certain skaters opted still to use the quad skates. In seasons , this changed to every single jam starting from a standstill start from the black line.
In either case, jammers had to start from the back of the pack the whole group and work their way through, with the first jammer to break out winning the status of lead jammer.
The skaters then got one point for every opponent they successfully lapped. The lead jammer could cut off the jam early by placing their hands on their hips.
The last jam of the last period always went the full minute regardless of what the period clock showed. At the referee's discretion, skaters would sit in a penalty box for violating the rules for various reasons, from jams, or face immediate disqualification ejection from the game.
Skaters frequently racked up these penalties and were willing to take it if they felt it would bring them a moral victory.
The team with the most points won the game. If the game was tied in regulation, originally the genders would continue to alternate in sudden death overtime periods until there was a clear winner.
As this could go on for a considerable and indefinite period of time, it was soon replaced one skater from each team facing off in a "Tiebreaker Match Race", five laps around the track and whoever crossed the finish line first won the game for their team.
In addition, special features which were not directly part of the matches would occasionally pop up:.