U.S. Marine Corps Sgt. Maj. Bryan Zickefoose, U.S. Southern Command senior enlisted leader, speaks to 12th Air Force (Air Forces Southern) Airmen at Davis-Monthan Air Force Base, Ariz., Jan. 9, 2019. U.S. Southern Command is responsible for all Department of Defense security cooperation in the 45 nations and territories of Caribbean and Central and South America. (U.S. Air Force photo by Tech. Sgt. Angela Ruiz)