RAF E-3 Sentry receives fuel
A Royal Air Force E-3 Sentry, operating in a NATO capacity, breaks off after receiving fuel from a 100th Air Refueling Wing KC-135 Stratotanker April 17, 2014, over Eastern Europe. The 351st Air Refueling Squadron is the only aerial refueling squadron in U.S. Air Forces in Europe and Air Forces Africa, and has refueled more than 2,000 aircraft since fiscal year 2014 began. (U.S. Air Force photo by Airman 1st Class Preston Webb/Released)