An F-15 Eagle from the 104th Fighter Wing, Barnes Air

An F-15 Eagle from the 104th Fighter Wing, Barnes Air National Guard Base, Mass. refuels at the boom of a KC-135R Stratotanker from the 108th Air Wing, Joint Base McGuire-Dix-Lakehurst, N.J., while conducting cross-border training over Finland and Sweden during Arctic Challenge Exercise 2019 on May 27, 2019. The F-15s and KC-135 are supporting Arctic Challenge Exercise 19, a Nordic aviation exercise intended to provide scenario-based training to prepare partner forces for enemy defensive systems. (U.S. Air National Guard photo by Staff Sgt. Kenneth Shaner Brown)