The purpose of thi3 study was to determine-whether there is a difference in the body heat build-up under the standard Marine Corps upper torso body armor versus the NMFRL lightweight prototype body armor. Twenty young adult Marines made two forced marches of 3 mi each, one with each of the above armors. Mean chest skin temperature under the prototype armor was 2°F. less than under the standard armor. No difference was observed in rectal, arm, or abdominal temperatures.
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