MIL-H-45374D, MILITARY SPECIFICATION: HOWITZER, MEDIUM, SELF-PROPELLED, 155-MM: M109, M109A1, M109A1B, M109A2, M109A3, AND M109A5 (29-JAN-1988)
MIL-H-45374D, MILITARY SPECIFICATION: HOWITZER, MEDIUM, SELF-PROPELLED, 155-MM: M109, M109A1, M109A1B, M109A2, M109A3, AND M109A5 (29-JAN-1988)., This specification covers Howitzer, Medium, Self-Propelled, 155-mm: M109 Series.