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. 2021 Jun 25;11:13313. doi: 10.1038/s41598-021-90918-9

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2021

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Sample image of the environment used during the force-on-force stress-inoculation training event against a single peer opponent. Participants were confined with a 4.9 m × 4.9 m space. Participants used pistols modified to fire non-lethal training ammunition and wore face, throat, and groin protection.