Swim Test Marines with the 31st Marine Expeditionary Unit’s Maritime Raid Force supervise Marines treading water during a reconnaissance screening at Camp Hansen in Okinawa, Japan, Oct. 27, 2017. The 31st MEU provides a flexible force ready to perform a wide range of military operations throughout the Indo-Asia-Pacific region as the Marine Corps’ only continuously forward-deployed MEU. Marine Corps photo by Cpl. Stormy Mendez SHARE: Download: Full Size (1.16 MB) Credit: Lance Cpl. Stormy Mendez VIRIN: 171027-M-GO150-340C.JPG Photo Gallery