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There are hydration charts like this up all over in heads in the Marine Corps. The first one I saw was in Boot Camp, and after staring at it for about 30 seconds I realized what it was for. There were guys in Boot Camp with me that didn't figure it out for weeks. Ours had more colors and didn't mention "glasses of water" but canteens. I drank more water in Boot Camp than at any time before or since (although I do drink about 100 ounces a day now).