Yeah, I was wondering that too. For now, I save my game everytime I complete an objective, and when the next mission I get, when I report in, is too much of a hassle/bore (I just had a photo-recon of Yokohama harbor, completed this, sailed out to the Marianas, reported in, and got the request for an intelligence update of : Yokohama harbor

) ->> load savegame
This way I have avoided not completing any objectives.
On a sidenote: I just completed patrol 7 of my new Tambor/Start of war campaign after a reinstall (I now play vanilla, waiting for a full TM 1.7.5 install file

), now it's december 42, and I have completed (on average) 3 objectives per patrol. I've gotten four offers for a new command, but I chose to reload the Patrol-end savegame every time. Why?, you ask: every new command I was offered was the same USS Drum!!!

I don't mind skippering a Gato around (as this will enable me to go to Brisbane command, the Tambor doesn't get that option (I have been looking through a bunch of game-files to figure that out)),
but i would like to have some variation in the Gato-class sub I'm offered (Tang perhaps

).
I suspect the new command that is offered has something to do with the Date of Commission (found in the Roster-files, I believe), and I believe that USS Drum was the first Gato that was commissioned, so that's probably why I always get the Drum offered.
So, is there a way ingame to get a 'later-date' Gato?? perhaps wait with accepting a new command until a much later date?
Or will I have to alter some files, to get 'rid' of the USS Drum?
Greetz,
@Lantis