Senior Airman Michael Duvall, a Reservist assigned to the 931st Security Forces Squadron, McConnell Air Force Base, Kan., sites down the barrel of an M4 carbine rifle with an M203 grenade launcher attached. Duvall was taking his turn firing the M203 at the base Combat Arms Training and Maintenance facility as part of a four-day field training excercise being conducted by the squadron in preparation for future deployments. The M203 is a single-shot weapon that fires a 40mm grenade with an effective range of approximately 350 yards. (U.S. Air Force photo by 1st Lt. Zach Anderson)
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