180418-M-GO150-157 PACIFIC OCEAN (April 18, 2018) Marines assigned to Marine Fighter Attack Squadron (VMFA) 121, 31st Marine Expeditionary Unit (31st MEU) load a GBU-12 Paveway II laser-guided bomb onto an F-35B Lightning II aboard the amphibious assault ship USS Wasp (LHD-1) during a certification exercise (CERTEX) while underway in the Pacific Ocean, April 18, 2018. During CERTEX, VMFA-121 conducted an expeditionary strike – an aerial strike launched from the sea. The 31st MEU and Amphibious Squadron 11 conduct certification exercise as the final evaluation in a series of training exercises which ensures readiness for crisis response throughout the Indo- Pacific region. (U.S. Marine Corps photo by Cpl. Stormy Mendez/Released)