This is an Army gun fired armor piercing capped projectile. APC-T (Army) and AP (Navy). These projectiles have a hardened AP cap over the nose of the body to which the windshield is secured. The AP cap increases the penetration ability of the projectile. Most APC-T projectiles, and all Navy AP projectiles 3 inches and larger, incorporate a small HE main charge in the base with a BD fuze which detonates after the projectile penetrates a target.
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