U.S. Air Force Tech. Sgt. Zach Vaughan, a crew chief with the 173rd Fighter Wing in Klamath Falls, Ore., signals the F-15 pilot that the wheel chalks are in place curing preparation for taxi to the runway while in in Tucson, Ariz., Jan 17, 2020. The wing brought five F-15 aircraft and nearly 90 people to help the 162nd Fighter Wing train fledgling F-16 pilots for two weeks. (U.S. Air National Guard photo by Master Sgt. Jefferson Thompson)