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Rugger_Can has quite wisely identified the zipper issue: they appear to be wearing dark gray/charcoal coveralls (most likely Nomex flight suits) -- and that's the bottom zipper of it we see; the guy on the right, you can see has a knife (folder) clipped in his left leg pocket.
The image is also pretty desaturated; I boosted gamma and saturation and the colors become defined, revealing the gray coveralls and clearly RG body armor. Looking at the brightened image I'm thinking maybe an IOTV.
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