A four-ship formation of 20th Fighter Wing (FW) F-16CM Fighting Falcons fly off the coast of South Carolina, July 21, 2017, commemorating the 100th anniversary of the 55th Fighter Squadron (FS.) The formation consisted of flagship aircraft from the 20th FW, the 55th, 77th and 79th FSs. The 20th FW, which celebrated its 70th anniversary July 28, will also celebrate the 100th anniversaries of the 77th and 79th FSs in February 2018. (U.S. Air Force photo by Tech. Sgt. Gregory Brook)