U.S. Air Force Lt. Col. William Alcorn, 7th Operations Support Squadron, mission training center director, briefs U.S. Air Force Gen. Hawk Carlisle, commander of Air Combat Command, on the B-1B Lancer’s Integrated Battle Station and Sustainment-Block 16 upgrade April 30, 2015, at Dyess Air Force Base, Texas. This upgrade is the largest B-1 modification in the program’s history. (U.S. Air Force photo by Airman 1st Class Autumn Velez/Released)