A 391st Fighter Squadron crew chief troubleshoots an F-15E Strike Eagle starter during Green Flag West, June 11, 2018, at Nellis Air Force Base, Nevada. The 391st FS participated in Green Flag to further enhance readiness by training on Close Air Support over the National Training Center, Fort Irwin, California. (U.S. Air Force photo by Airman 1st Class JaNae Capuno)