Many thanks for answer!
Any other color plastic canteens were manufactured for commercial sales
I understood, canteens - only olive green. But covers these canteens ( tan color) can be considered as the "army"?

PS When I was looking for information on the canteens, then accidentally I found interesting pictures of Natick Center, apparently it experiments with canteen insulating. In the first photo - probably earlier version of Cold Weather CRS?

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Natick Soldier Systems Center Photographic Collection / Topic: Canteens (Beverage containers) - Digital Commonwealth Search Results