The M141 Bunker Defeat Munition (BDM) is a disposable single-shot, shoulder-fired rocket launcher designed to defeat hardened structures. It is a modification of the United States Marine Corps Mk 153 Shoulder-Launched Multipurpose Assault Weapon (SMAW) and is also called the SMAW-D (where 'D' is for 'Disposable'). It was designed to fill the void in the United States Army inventory of a "bunker buster" weapon.