ELLSWORTH AIR FORCE BASE, S.D.--Maj. Chris Lovegren, 34th Bomb Squadron pilot, operates the Beyond Line Of Sight system of a B-1B Lancer during his pre-flight checklist Nov. 23. The BLOS system is capable of providing a variety of information including high-resolution terrain mapping. (U.S. Air Force photo/Airman 1st Class Corey Hook)