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PCU is designed to protect you from the natural elements ie: rain, snow, wind, etc.
The whole FR thing is mostly to protect the soldiers in the humvees who hit an IED. Soliders were seeing burn injuries from having clothes light on fire, the need was recognized for fire resistant clothing as your combat effectiveness is pretty much reduced to zero if you're on fire. As well, if you're already fucked up and cant move at least you won't also be on fire...
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