U.S. Air Force Senior Airman Ethan Grinder, 386th Expeditionary Security Forces Squadron, loads a Mark 19 40 mm grenade machine gun for Staff Sgt. Jonathan Killebrew on May 7, 2014 at an undisclosed location in Southwest Asia. Both are deployed from the 99th Security Forces Squadron at Nellis Air Force Base, Nevada. Qualified Security Forces members practice shooting every two months to maintain proficiency with the weapons system. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)

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U.S. Air Force Senior Airman Ethan Grinder, 386th Expeditionary Security Forces Squadron, loads a Mark 19 40 mm grenade machine gun for Staff Sgt. Jonathan Killebrew on May 7, 2014 at an undisclosed location in Southwest Asia. Both are deployed from the 99th Security Forces Squadron at Nellis Air Force Base, Nevada. Qualified Security Forces members practice shooting every two months to maintain proficiency with the weapons system. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)

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386th Expeditionary Security Forces Squadron perfom proficiency training on the Mark 19 40mm grenade machine gun

U.S. Air Force Staff Sgt. Jonathan Killebrew, 386th Expeditionary Security Forces Squadron, fires a Mark 19 40mm grenade machine gun on May 7, 2014 at an undisclosed location in Southwest Asia. Killebrew is deployed from the 99th Security Forces Squadron at Nellis Air Force Base, Nev. Qualified Security Forces members practice shooting about every two months to maintain proficiency with the weapons system. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)

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U.S. Air Force Tech. Sgt. Nathan Hardin, 386th Expeditionary Security Forces Squadron, fires a Mark 19 40 mm grenade machine gun on May 7, 2014 at an undisclosed location in Southwest Asia. Hardin is deployed from the 150th Security Forces Squadron at Kirtland Air Force Base, New Mexico. Qualified Security Forces members practice shooting about every two months to maintain proficiency with the weapon system. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)

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Detail image of a Mark 19 40 mm grenade machine gun loaded with Target Practice Tracer grenades on May 7, 2014 at an undisclosed location in Southwest Asia. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)

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386th Expeditionary Security Forces Squadron proficiency training on the Mark 19 40mm grenade machine gun.

Published May 9, 2014

386th Expeditionary Security Forces Squadron perfom proficiency training on the Mark 19 40mm grenade machine gun