An F-16 Fighting Falcon fuel patch is worn on the arm of a Chilean Air Force as a U.S. Air Force Staff Sergeant stands next to him during a hydrazine Mobile Training Team hands-on training at Los Condores Air Base, Chile, Nov. 8, 2018. The Chilean Air Force requested the hydrazine MTT to refresh their Airmen’s knowledge and understanding of a hydrazine servicing stand and servicing hydrazine tanks. (U.S. Air Force photo by Tech. Sgt. Angela Ruiz)