The Special Atomic Demolition Munition (SADM), also known as the XM129 and XM159 Atomic Demolition Charges,[1] and the B54 bomb[2] was a nuclear man-portable atomic demolition munition (ADM) system fielded by the US military from the 1960s to 1980s but never used in combat.
Operational Review of the XM-129/XM-159 Atomic Demolition Charge (B54 SADM)
W54Report
was invoked but never defined (see the help page).