U.S. and Swedish soldiers scout the enemy's location from the top of a Swedish Strf-90 tracked infantry fighting vehicle during Exercise Aurora 17 in Lärbro, Sweden, Sept. 21, 2017. Aurora 17 is the largest Swedish national exercise in more than 20 years, and it includes supporting forces from the U.S. and other nations to exercise Sweden’s defense capability and promote common regional security. Marine Corps photo by Staff Sgt. Marcin Platek