At least some anti-ballistic missiles (ABMs) use shrapnel-like warheads instead of the more common blast-fragmentation types. As with a blast-frag warhead, the use of this type of warhead does not require a direct body-on-body impact, so greatly reduces tracking and steering accuracy requirements. At a predetermined distance from the incoming re-entry vehicle (RV) the warhead releases, in the case of the ABM warhead by an explosive expulsion charge, an array of mainly rod-like sub-projectiles into the RV's flight path. Unlike a blast-frag warhead, the expulsion charge is only needed to release the sub-projectiles from the main warhead, not to accelerate them to high velocity. The velocity required to penetrate the RV's casing comes from the high terminal velocity of the warhead, similar to the shrapnel shell's principle. The reason for the use of this type of warhead and not a blast-frag is that the fragments produced by a blast-frag warhead cannot guarantee penetration of the RV's casing. By using rod-like sub-projectiles, a much greater thickness of material can be penetrated, greatly increasing the potential for disruption of the incoming RV.