why don't i get any varity in missions?

[Gigalocus]

Been playing loads sinse its come out, but im negining to get annoyed now, because EVERY mission i've had is to patrol, its really boring now , why don't iget any variety? im reading asbout people dropping ammo, lifeguard duty, the only time i haven't had the patrol mission is when i started a new campaign in Pearl, and that was just one of drop off an agent right off Japan, then, more patrols, it just seems to be SHIII, but with different ships/scenery. Can i change anything to give me more chance of getting another mission.
Also, my first mission, i go off and PATROL, and come back to manila, and find it crawling with DDs, i meen crawling, atlest 10 - 15 , i've got screenshot to, but why have they come into manila? (still controlled by allies, and i could dock, and there was even a fishing boat, but why were they there?

Thanks - Gigalocus < sorry, i thought he was funny