The M4 Napalm Adherent Weapon (more formally, Flame Projector, Fuel Adherent, Model 4), marketed by Weapon System Technologies as the NA4 Flamethrower, is a man-portable backpack flamethrower in use with the United Nations Space Command Defence Force. Despite its name, the M4 does not project a stream of napalm, instead making use of the similar though more destructive Pyrosene-V.