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The interim slat armor solution forms a metal frame
barrier 50 cm ahead of the APC. The cage detonate anti-tank shaped
charge warheads such as RPG away from the vehicle and prevent its
hot chemical reaction from boring through and causing burns, shock
and shrapnel wounds. General Dynamics, the Stryker manufacturer,
is also developing an add-on plate armor that will defeat RPGs,
planned for deployment by 2005. The slat armor weighs about 5,200
pounds, about 3,000 pounds lighter than the add-on anti-RPG add-on
armor plates. The idea behind the cage armor goes back to World
War II and Vietnam. Troops in that war improvised with chicken
wire and other means to counter the RPG threat.
In Iraq, Slat armor proved quite
successful in defeating attacks of High Explosive Anti-Tank (HEAT)
of Rocket Propelled Grenade (RPGs). This type of armor is not
effective Attacks by high explosive and fragmentation RPG rounds
which explode before they hit the cage. In one mission, a Stryker
vehicle, with slat armor, was attacked and hit with nine RPGs. The
locations of the hits on the vehicle were sporadic. The crew
escaped with minor injuries and the vehicle moved under its own
power to the nearest operating base for assessment and repair. To
improving protection for exposed crews, some units have built a
wooden platform over the ramp to hold sand bags to protect the
rear hatch. ammunition cans filled with sand were located around
the gunners hatch.
While Slat armor does not significantly impact Stryker handling,
off or on roads, during the dry season, the additional weight
significantly impacts the handling and performance during the
rainy season. The additional weight of the slat armor was not
accounted for in the design of the Central Tire Inflation System (CTIS).
The heavy oversized cage causes multiple problems for safe and
effective operation of the vehicle.
Slat armor was initially deployed with
US Army Stryker AFVs operating in Iraq. The British Army deployed
similar protection to augment the armor of the Warrior AIFV.
Similar modifications were performed on Australian Light Armored
Vehicles. 
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