U.S. Marine Corps F-35B Lightning II aircraft with Marine Fighter Attack Squadron (VMFA) 121 depart Marine Corps Air Station Iwakuni, Japan, Sept. 17, 2017. The F-35B Lightning II aircraft joined U.S. 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 Sgt. Carlos Cruz Jr.)