ELLSWORTH AIR FORCE BASE, S.D. -- (Left to right) Airman 1st Class Christopher Bratton and Senior Airman Adam McCary, 28th Civil Engineer Squadron electrical power production members, unscrew bolts to roller sheaves before removing them from a mobile aircraft arresting system, Oct. 15. The roller sheaves, when in place, run a large belt through the MAAS. (U.S Air Force photo/Airman 1st Class Anthony Sanchelli)