1 or 2 landing force Sailor will be just right ... use more engs and Repairs ... but  u need those two sailors high lvld and good vets  on them to be faster 

depends on how much damage you want to deal i can tell you 3 fully vetted marines do a great job 

The more you have means the more little dudes you can send out to fight on the beach. It doesn't matter how many you have as they do not stack like engineers do. If you have vets on them As I do they will hit slightly harder.

The correct answer for taking a harbor is to not waste your time with landing forces and to use airlift instead.

Racist radioman

what do airlifts do when they reach harbor are you going to click something or what

Hack the rolling of Vets much ?