U.S. Marine Corps F-35B Lightning II aircraft with Marine Fighter Attack Squadron (VMFA) 121 depart Marine Corps Air Station Iwakuni, Japan, Sept. 18, 2017. The F-35B Lightning II aircraft joined United States Air Force, Japan and Republic of Korea Air Force aircraft in a sequenced bilateral show of force over the Korean peninsula. This show-of-force mission demonstrated sequenced bilateral cooperation, which is essential to defending U.S. allies, partners and the U.S. homeland against any regional threat. (U.S. Marine Corps photo by Cpl. Aaron Henson/Released)