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A pilot with Marine Fighter Attack Training Squadron 501 exits his aircraft after returning from the first operational test of the F-35B Lightning II, May 29. VMFAT-501 spent 11 days onboard the USS Wasp to demonstrate the capability of the F-35B to deploy onboard an amphibious ship. - A pilot with Marine Fighter Attack Training Squadron 501 exits his aircraft after returning from the first operational test of the F-35B Lightning II, May 29. VMFAT-501 spent 11 days onboard the USS Wasp to demonstrate the capability of the F-35B to deploy onboard an amphibious ship.