Experimental testing has demonstrated that the system 100 is effective to defeat an AP bullet fired from a rifle at point-blank range (e.g. at impact V.sub.p.apprxeq.850 meters/second). Applications include, but are not limited to, body armor for infantry soldiers and law enforcement agencies, integral armor or armor appliques for vehicles such as aircraft, helicopters, and cars. Other uses include military applications, such as used in conjunction with ground vehicles or amphibious assault vehicles. Thus, the system 100 for protection against a projectile 105 having a speed, or velocity V.sub.p, comprises an accelerating layer 110, a plug layer 120, and (optionally)...