Capt. Mellorie Clinton, Commander of Delta Battery, 5th Battalion, 7th Air Defense Regiment explaining the Patriot Site layout to Capt. Bartosz Rozek, Commander of the Polish 3-7 Air Defense Squadron during exercise Astral Knight 20 at Szymany Air Base, Poland, Sept. 22, 2020. Astral Knight 20 is a joint, multinational exercise involving Soldiers and Airmen from the United States working with service members from Poland, Latvia, Lithuania, Estonia, and Sweden.