Tech. Sgt. Kristian Baarsvik, U.S. Air Force Band’s Airmen of Note lead alto saxophone player, gives a hand command during the Jazz Heritage Series, Feb. 22, 2019 in Alexandria, Va. Hand gestures are often used to signal a stop in which everyone can be on the same queue and stop together. (U.S. Air Force photo by Senior Airman Alyssa D. Van Hook)