Senior Airman Jordan Thompson, a 168th Alaska Air National Guard combat arms training instructor, nods in approval as Airman 1st Class Nathaniel Kibler, a 354th Security Forces Squadron response force member, fires a Mark 19 grenade launcher during training Sept. 9, 2015, at Eielson Air Force Base, Alaska. Thompson was leading the training to qualify members of the 354th Security Forces Squadron on the weapon. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)