What is 'Black Flag?' Inside the Air Force's Newest Major Exercise F-15Es and F-16s from 422nd Test and Evaluation Squadron refuel from a KC-46 over the Nevada Test and Training Range on November 17, 2020 for Large Force Test Event 20.03. (U.S. Air Force/1st Lt Savanah Bray) 29 Dec 2020 The U.S. Air Force has just signed off on a new flag exercise that brings together large weapons and capabilities under one comprehensive test event. Air Combat Command's Gen. Mark Kelly earlier this month authorized "Black Flag," a tactics and integration exercise at Nellis Air Force Base, Nevada, the service said in a release.