By the way all you do is open your subs save file near the very top should there should be a line that says officers and a number all you do is change this number and save and then you can have an extra officer or CPO if you need one. You could also make the enlisted crew larger but this is truly not needed though an extra officer can be useful.though if you where a stickler for realism you could make the total crew size to the real life level it would on be on "paper" though as obviously you cant place 70+ men in the crew slots the game happends to include.