HOWITZER RETIREMENT Sgt. Nathan Hughes stands next to a M198 howitzer during a retirement ceremony for the weapon on Camp Atterbury Joint Maneuver Training Center, Ind., Sep. 18. Hughes is a gunner assigned to the 2nd Battalion, 150th Field Artillery Regiment. The M198 howitzer, which has been in service since 1979, is being replaced by the M777 howitzer, which is smaller and approximately 40 percent lighter. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 107345-B-PEG73-083.jpg Photo Gallery