Members of the 633rd Security Forces Squadron Emergency Services Team performed a ruck march from Shellbank Fitness Center to Combat Arms Training at Joint Base Langley-Eustis, Va., April 28, 2017. The EST members developed and tested a qualification course, based on the teams abilities to effectively handle hostage and barricaded suspect scenarios, which will be used to assess future candidates looking to join the team. ( Air Force photo/Senior Airman Derek Seifert)

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