Full metal jacket

摘要

Soldiers kitted up in expectation of their first taste of combat often reflect on how much of their bodies a bulletproof jacket and helmet do not cover. About 81%, it turns out. More armour than this would be unpractically heavy. Indeed, many soldiers already carry at least 50kg of kit and supplies, which is more than double what America's Army Science Board advises as the limit if damage to a soldier's skeleton and musculature is to be avoided.