Military connectors seem a stretch whereas Lemo F connectors would fit the... whatever because they come in a cornucopia of sizes, from 2 to 68 pins. 69 if you count the shield. Just chuck the male side in a rotary hammer enclosed in a stamped metal case and the user won't know the difference. They're even suitable for harsh environments.

https://www.lemo.com/en/products/harsh-environment-connector...