Fragging is a term from the Vietnam War, use primarily by U.S. military personnel, most commonly meaning to assassinate an unpopular officer of one's own fighting unit, often by means of a fragmentation grenade (hence the term). A hand grenade was often used because it would not leave any fingerprints, and because a ballistics test could not be done (as it could to match a bullet with a firearm). The grenade would often be thrown into the officer's tent while he slept. Sometimes the intended victim would be 'warned' by first having a smoke grenade thrown into his tent. If he persisted in antagonizing his men, this would be followed by a stun grenade, and finally by a fragmentation grenade. A fragging victim could also be killed by intentional friendly fire during combat. In this case, the death would be blamed on the enemy, and, due to the dead man's unpopularity, the perpetrator could assume that no one would contradict the story.