Airman 1st Class Aaron Caldwell, an Advanced Integrated Avionics Systems journeyman with the 69th Maintenance Squadron, poses for a photo next to a Block 40 RQ-4 Global Hawk inside a hangar on Grand Forks Air Force Base, N.D., Feb. 5, 2015. Airmen such as Caldwell attend and complete technical training courses for Electronic Principles and Avionics Systems in order to become aircraft maintainers.(U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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