ELLSWORTH AIR FORCE BASE, S.D. - A B-1B Lancer flies above Col. Trent Edwards, 28th Mission Support Group commander and Col. Jeffrey Taliaferro, 28th Bomb Wing commander while they perform a perimeter check with 28th Security Forces Squadron Airmen. The SFS Airmen perform the checks regularly to ensure the integrity of the base perimeter. (Courtesy photo/Master Sgt. Carlos Moore)