Helo lifts 57 air conditioning units to roof of Oklahoma City Air Logistics Complex main production facility
A Sikorsky S-58 heavy-lift helicopter hovers over heating units being moved to the roof of building 3001 as part of on-going energy efficiency upgrades taking place across Tinker Air Force Base, Oklahoma on May 27, 2018. The units were lined-up on an abandoned taxiway to allow the units to be moved quickly to the roof of the building which had been shut-down out of safety concerns. (U.S. Air Force photo/Greg L. Davis)