U.S. Army Sgt. 1st Class Derik Allen, National Support Element noncommissioned officer in charge of postal operations, and Command Sgt. Maj. Harley Schwind, NATO Headquarters Sarajevo command senior enlisted leader, prepare presentations at Rajlovac Barracks, Bosnia and Herzegovina, Oct. 28, 2015. A group of American NCOs were invited to lecture Armed Forces of Bosnia and Herzegovina soldiers on several military topics. (U.S. Air Force photo by Staff Sgt. Clayton Lenhardt/Released)