Competitors in the 2018 Advanced Combat Skills Assessment plot their course to their next checkpoint, during the land navigation test, 19 June 2018, on Andersen Air Force Base, Guam. The ACSA tested security forces teams from throughout the Pacific Air Forces on core tasks of base defense, to include landnav, tactics, mental and physical challenges, and weapons firing.

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Photo credit: © Barney Low / Alamy / Afripics
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