Old guy here. I’m not trying to disparage the author of this article but it needs a correction. “K” rations were used during WWII initially by our Airborne Paratroopers. They had to bring everything with them and had no resupply until their objective was taken or they died trying. US Army general issue and use came later. “C” rations were used in Vietnam, Laos, and Cambodia. There I fixed it for you. 😉