in the 80's I've had a US ration called "flight ration" or something like that.
It was almost identical to a MCI except this marking on the box, the flap was on the narrowest side of the box, there was a can of orange juice in the ration and also a toothpick called "interdental stimulator"!
In fact, I found the idea of calling a toothpick "interdental stimulator" so funny that I still remember the name 20 ou 25 years later

I think the entree in the box was a turkey loaf, or was it "beef & potatoes"...?

Do you know the kind of ration?