Staff Sgt. Courtney Armstrong, 28th Aircraft Maintenance Squadron crew chief, explains the flight control system of a B-1B to Ed Butler, a medically-retired U.S. Army veteran, and Butler’s granddaughter, Makennah Woods, at Ellsworth Air Force Base, S.D., Jan. 17, 2012. Touring a B-1B was one of Butler’s last wishes after being diagnosed with terminal cancer. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)