Howitzer Blast The earth shakes as an M109A6 Paladin fires a gas-propelled 155 mm howitzer round through the enormous canon, as the Army’s 1-9 Field Artillery, 2nd Heavy Brigade Combat Team, 3rd Infantry Division, conducts gun calibration at Destiny Range in Mosul, Iraq, April 23, 2010. SHARE: Download: Full Size (1.64 MB) Tags: Iraq, Army Credit: Gregory Gieske VIRIN: 100423-A-ZZ999-003A.JPG Photo Gallery