FINAL ROUND U.S. Army soldiers fire the final round of an M-198 155mm towed howitzer during a retirement ceremony on Camp Atterbury Joint Maneuver Training Center, Ind., Sept. 18, 2010. The last shot fired marked the end of 18 years of the crew firing the M-198. The soldiers are assigned to the 2nd Battalion, 150th Field Artillery, Indiana National Guard. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 815936-L-HTD72-766.jpg Photo Gallery