I'm rice paddy daddy on most of the forums i belong to because I'm a Vietnam Veteran.
I brazenly lifted it from a 1960's anti war song by a very obscure group called The Fuggs.
Mermite cans.
In Nam we had one small signal detachment on a radio intercept camp, and once a day we'd load up a hot meal for them and run it out by jeep.
I was a company cook on a combat base. I'm very familiar with those. And M1937 field stoves, which ran on gasoline and compressed air.