The U.S. military does not have any uniform guidance on this. The Navy and Marine Corps official guidance is that urine should be lightly straw-colored. Hyponatremia is warned against just as strongly as dehydration.

The military has like an hour of exercise a day, no? If you are walking 10 feet to a car and driving to site in a cube all day, I don’t think you have the same hydration needs as someone physically exerting themselves.

I think the point was that if you exercise a lot, eat enough, and drink yourself to clear pee, you still get enough electrolytes. So a less strenuous plan with enough food presumably also means one gets enough electrolytes.

You'll still be low on Magnesium if you sweat and perform for 60min+ — which leads to stuff like restless legs and rather bad sleep.