354th SFS Mark 19 training
Combat arms training instructors Senior Airman Jordan Thompson (right), 168th Alaska Air National Guard, and Staff Sgt. Gregory Chmielewski, 354th Security Forces Squadron, replace the barrel on a Mark 19 grenade launcher during training Sept. 9, 2015, at Eielson Air Force Base, Alaska. Thompson and Chmielewski were training members of the 354th Security Forces Squadron on the weapon. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)

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Photo by: Staff Sgt. Shawn Nickel |  VIRIN: 150909-F-FT438-228.JPG