McGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. - Bulgarian Air Force sergeant Yordanka S. Petrova-Angelova, left, attending Noncommissioned Officer Academy Class 13-7 participates in group interpersonal practice with fellow students at the Paul H. Lankford Enlisted Professional Military Education Center at the I.G. Brown Training and Education Center (TEC) here, July 23, 2013. Two Bulgarian airmen are the first to attend enlisted professional military development here this summer as part of the National Guard's State Partnership Program between Tennessee and Bulgaria, established in 1993. (U.S. Air National Guard photo by Master Sgt. Kurt Skoglund)