Keywords: 130121-F-NE761-231 (8424536124).jpg A Singapore Air Force airman reads a preflight checklist during Red Flag 13-2 at Nellis Air Force Base Nev Jan 21 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 DoD photo by Staff Sgt William P Coleman U S Air Force/Released https //www flickr com/photos/39955793 N07/8424536124/ 130121-F-NE761-231 2013-01-21 12 36 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 N07/8424536124 2016-09-03 09 31 59 United States Government Work 425th Fighter Squadron Aircraft at Nellis Air Force Base Military in Nevada United States Department of Defense |