NATO strives for optimum interoperability
SPANGDAHLEM AIR BASE, Germany – Bulgarian air force Senior Master Sgt. Kalin Krumov, left, and Maj. Iliyan Antonov, overlook the radar operations of the 606th Air Control Squadron Sept. 12 here, during a visit from the Bulgarian air force. The tour serves as a way for the United States and Bulgaria to learn and exchange ideas about each other’s air force to ensure air dominance in any contingency operation. (U.S. Air Force photo by Airman 1st Class Gustavo Castillo/Released)