U.S. Air Force F-15 Eagles from the 104th Fighter Wing, Barnes Air National Guard Base, Mass., form up next to Swedish Air Force F-16 Falcons behind a KC-135R Stratotanker, from Joint Base McGuire-Dix-Lakehurst, N.J., after receiving fuel over Sweden, May 24, 2019. The aircraft 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)

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Photo by: Staff Sgt. Kenneth S. Brown |  VIRIN: 190524-Z-PK324-1822.JPG