Marine Corps Cpl. Jessica L. Collins prepares to practice breathing from a compressed air supply while hanging upside-down during Modular Amphibious Egress Training aboard Camp Hansen, Okinawa, Japan, Sept. 14, 2016. Valiant Shield is a biennial Air Force, Navy and Marine Corps exercise held in Guam, focusing on real-world proficiency in sustaining joint forces at sea, in the air, on land and in cyberspace. ( Marine Corps photo by Cpl. Janessa K. Pon)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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