Entering service in the early 1960s, the M109 Self-Propelled Howitzer has been in production for 34 years and forms the backbone of US Army and Reserve artillery units. The M109A6 is the latest development of the M109 series and incorporates advanced fire control systems that enable it to have the first rounds on target in less than 60 seconds after arriving at the firing location. This ability to quickly shift from travel to firing to moving again is to avoid counter battery fire and ensures battlefield survivability of the weapon. This book details the versatile M109, which has served around the globe, seeing service in Southeast Asia, Desert Shield and Desert Storm.