Armor Developments
Improvements to the armor of main battle tanks have reduced the usefulness of HEAT warheads by making man portable HEAT missiles heavier, although many of the world's armies continue to carry man portable HEAT rocket launchers for use against vehicles and bunkers. In unusual cases, shoulder-launched HEAT rockets are believed to have shot down U.S. helicopters in Iraq. Today HEAT rounds are primarily used in shoulder-launched and in jeep- and helicopter-based missile systems. Tanks mostly use the more effective APFSDS rounds.
The reason for the ineffectiveness of HEAT munitions against modern main battle tanks can be attributed in part to the use of new types of armor. The jet created by the explosion of the HEAT round must have a certain distance from the target and must not be deflected. Reactive armor attempts to defeat this with an outward directed explosion under the impact point, causing the jet to deform and so greatly reducing penetration power. Alternatively, composite armor featuring ceramics erode the liner jet more quickly than rolled homogeneous armor steel, the then-preferred material in the construction of armored fighting vehicles.
Spaced armor and slat armor are also designed to defend against HEAT rounds, protecting the vehicle by causing a premature detonation of the explosive at a relatively safe distance away from the main armor of the vehicle.
Read more about this topic: High Explosive Anti-tank Warhead
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