A-10 Thunderbolt IIs from Whiteman Air Force Base, Missouri, get into formation, Sept. 9, 2015, after receiving fuel from a KC-135 Stratotanker assigned to RAF Mildenhall, England, over Estonia. The A-10s, commonly known by its nickname “Warthog,” deployed and participated in the air refueling in support of a NATO-led operation. (U.S. Air Force photo by Airman 1st Class Justine Rho/Released)