Royal Air Force, Lakenheath, England A box of 120-volt, U.S. specification, power cords sits in front of an F-15E Strike Eagle. The 48th Fighter Wing is currently switching these cords with 240-volt, European specification, power cords on dual-voltage devices as a part of the Transformer Cut-Off Initiative, a USAFE (U.S. Air Forces in Europe-wide) energy savings initiative.