I know military ships can't use commercial jump drives. However, can commercial ships use military jump drives? Military drives don't make a ship military, and that would be good for a reliable, civilian tender. However, she would be useless as a fleet vessel if, after supporting the warships' jump, she couldn't jump herself. The design screen doesn't show more than one type of jump drive on the 'sheet', so I'm guessing installing two different types of drives on a single ship is unnecessary/pointless.