Chopper Commando has been released by the author, Mark Currie, and is exceptionally rare for not only getting an UPDATE after its freeware release
but also a complete remake in 2020 due to a talented fellow Chopper nostalgic.
Despite antiquated CGA graphics it has surprisingly high replay value due to a number of unique enemy units, multiple independent save-slots for different pilots, multiple difficulty levels, good/neutral/bad outcomes for mission endings (including
being shot for treason if you destroyed your own base) and a couple genuine secrets that were worth the effort to find.
Absolutely worth your time to try. It's easy to learn but complex enough to master that anyone from 5 to 50 will have a good time. My personal favorite tidbit is the mission-failure message where the general asks your newly-widowed wife out on a date.
DOS Freeware release:
https://www.dosgamesarchive.com/downloa ... -commando/
Remake:
https://blog.loadzero.com/blog/chopper258/.