You can use the Coleman kerosene lantern preheat cups to make preheat cups for your US GI stoves, or, you can silver braze your own cups like the cups I show in this video.
Cups: https://www.oldcolemanparts.com
The Midicap for US Military stoves is still available here:
https://i.materialise.com/en/shop/ite...
Intro/Outro music courtesy of the YouTube video library:
Cool Intro - Stings by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/...