Airman 1st Class Christian Mains, 28th Aircraft Maintenance Squadron able chief, studies a B-1B Lancer technical order at Ellsworth Air Force Base, S.D., Jan. 21. B-1 able chief Airmen must attend 22 academic days, consisting of 108 hours of training, at Detachment 8, 372nd Training Squadron at Ellsworth. (U.S. Air Force photo/Senior Airman Anthony Sanchelli)