In the United States, flamethrowers are broadly legal for personal ownership and use. California requires a permit for the possession of a flamethrower, and only Maryland has outright banned their ownership and use. No federal laws exist regarding flamethrowers, as they are not defined as weapons under the National Firearms Act. The United States is a signatory of the Convention on Certain Conventional Weapons, protocol III of which limits military use of flamethrowers; this does not extend to civilian use.