A weapon is an instrument used for the purpose of causing harm or damage to people, animals or structures. Weapons are used in hunting, attack or self-defense and range from simple implements like clubs and spears to complicated modern machines such as intercontinental ballistic missiles. One who possesses or carries a weapon is said to be armed.
Infantry support weapons - larger than personal weapons, requiring two or more people to operate correctly.
Fortification weapons - mounted in a permanent installation, or used primarily within a fortification. Usually high caliber.
Mountain weapons - for use by mountain forces or those operating in difficult terrain. This includes modifications of existing weapons for paratroopers.