Not sure if this has been reported yet, or if WAI.
If you create a military ship (grav survey for instance) with comercial engines, and a military jupm drive it won't jump because it has comercial engines and a military jump drive, which I guess is intended.
I then changed the jump drive to a comercial one, but the ship still won't jump. I assume this is a bug? If not there is no way to make a miltary ship with comercial engines (mostly used for survey ships I guess) that is jump capable?