The Honorable Miranda Ballentine, Assistant Secretary of the Air Force for Installations, Environment and Energy, prepares for departure after visiting various locations to obtain and understand the unique missions at Langley Air Force Base, Va., Feb. 18, 2016. Ballentine’s visit focused on the support for ongoing energy programs and joint operational energy modeling and simulation. (U.S. Air Force photo by Senior Airman Brittany E. N. Murphy)