Infantry from the Greek Army prep their gear prior to an air assault training with 10th Combat Aviation Brigade at Bezmer Air Base, Bulgaria, on July 21. The air assault, titled Swift Response, was the final mission of exercise Saber Guardian 17 and included service members from the Canadian Army and the U.S. Army's 173rd Airborne Brigade. (U.S. Army photo by Spc. Thomas Scaggs) 170721-A-TZ475-149