Keywords: 130128-F-XF291-222 (8444872395).jpg U S Air Force 1st Lt Andrew Johnson a 20th Bomb Squadron navigator conducts a preflight inspection on a B-52H Stratofortress aircraft during exercise Red Flag 13-2 at Nellis Air Force Base Nev Jan 28 2013 Red Flag is an advanced aerial combat training exercise held four to six times a year to train pilots from the U S NATO and other allied countries for real combat situations U S Air Force photo by Senior Airman Matthew B Fredericks/Released https //www flickr com/photos/39955793 N07/8444872395/ 130128-F-XF291-222 2013-01-28 19 23 https //www flickr com/people/39955793 N07 U S Department of Defense Current Photos PD-USGov U S Department of Defense Current Photos https //flickr com/photos/39955793 N07/8444872395 2016-09-03 09 32 48 United States Government Work Military in Nevada United States Department of Defense |