There may be tons of spare MREs that the Pentagon can spare, but only if the NORKs defect.
The South Korean’s military rations would be much more palatable to North Koreans than ours would be.
Arirang Special(Ep.302) The Soldiers’ Dining Table _ Full Episode
https://www.youtube.com/watch?v=vssBBMRpBX0&t=744s