1) Most you can just get in the Apex and it can survive the defences. Not some of the military ones.
2) Military ones - walk from the settlement and get out of line of sight - then call the Apex and it will be fine, unless there is air cover
3) If there is air cover. Walk further I guess? At that point I usually risk it and die/end up with a close escape, and resolve yet again to check it's not a Military settlement before taking a mission where I could end up running
