U.S. Air Force F-16 maintainers and pilots, assigned to the Air National Guard’s 169th Fighter Wing from McEntire Joint National Guard Base, S.C., send their last wave of jets back to South Carolina after completing their support of Arctic Challenge Exercise 2019 at Kallax Air Base, Luleå, Sweden, June 6, 2019. The remainder of jets, equipment and personnel are projected to return to homestation within the next couple of days. ACE 19 is a Nordic aviation exercise that provides realistic, scenario-based training to prepare forces for enemy defensive systems. U.S. forces are engaged, postured and ready to deter and defend in an increasingly complex security environment. (U.S. Air National Guard photo by Senior Master Sgt. Edward Snyder) More