U.S. Army Col. Bryan Suntheimer, exercise deputy commander and chief of staff for the Hawaii Army National Guard, fires a CIS 40 automatic grenade launcher in the Infantry Gunnery and Tactical Simulator during exercise Tiger Balm 13 at Pasir Laba Camp, Singapore, July 16, 2013. Tiger Balm is a bilateral exercise between U.S. Army Pacific and the Singapore Armed Forces designed to enhance interoperability between the two nations. (U.S. Army National Guard photo by Spc. Tyler Meister)