By 1969 in the 2nd Bn, 34th Armor, 25th Infantry Division, it was, "Meal Combat, Individual" aka C-rations for the mid day meal. Quite often, the evening meal came out on the resupply chopper and was B rations. Paper and plastic had replaced mess kits by then.
Unlike our dismounted bretheren, there was no weight penalty, so we carried C-rations by the case. In addition, we had the luxury of being equipped with a pair of tanker stoves. Further luxury came from carrying between 10 gallons of potable water in the 5 gallon cans on each side of the turret. But the supreme luxury was the Mermite can strapped somewhere on the turret In this case you can see it long side the commander's cupola. A case of canned beverages and ice would keep for three to four days.
Attachment 86868Attachment 86869Attachment 86870