The M109 is an armored combat-type self-propelled artillery of 155 mm calibre, manufactured in the U.S. since early 1960.
The U. S. still have a number of M109A5 in their forces. The M109 family is the most common western gun fire support, indirect manoeuvre brigades of the divisions of armored and mechanized infantry.
The crew of the M109 is a section chief, driver, three gunners preparing ammunition, loaded, and fired the weapon, and two gunners to aim the cannon.
Picture added on 09 October 2010 at 11:50