The U.S. Marine Corps became the first military branch to reach initial operational capability (IOC) with the F-35B Lightning II fifth generation fighter aircraft, on July 31, 2015 with a squadron of 10 F-35Bs ready for world-wide deployment.
Marine Fighter Attack Squadron 121 (VMFA-121), based in Yuma, Arizona, became operational following a five-day rigorous Operational Readiness
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