did you have to make 3 threads about it?
well, a mod will clean that up.
anyway
if you are far away from base you can warp back to base
just press ESC -> Exit Patrol and then ''Return To Base''
(note: You will not get the 100 Renown that you earn when you dock the uboat back to base)
if you are withing the 30KM distance from your home base
press ESC -> Exit Patrol and then ''Dock At (ur current Base)''
(Reward: 100 Renown)
same counts for Milcows
be close to them, ESC -> Exit Patrol and then ''Dock at Milcow''
(Note: If you are in the milkcow its a sort of a End Patrol so you have to give out the medals that the crew earns because you will lose them if you continue from the milkcow)