In Military aircraft, (some years ago in my experience) only soldered
connections were approved.

Are you sure? That is totally at various with ALL practises I have seen at
anytime in the last 25 years in anything electrical.

I have seen solder then crimp connections fail again and again, even though
they were specifically forbidden. never saw a crimp then solder connection
fail. crimp then solder is industry requirement, and has been for a very long
time. there is a good reason for that.