Damaged battleships can still attack or defend. They can be repaired when adjacent to a friendly industrial complex. Submarines now have the ability to travel through enemy occupied seazones. Two changes for transports . The movement rules for transports are changed.
Bombers have three new abilities now.
The bomber unit is able to carry a paratrooper unit. They can also conduct strategic bombing on an anti-aircraft gun. Bombers can also be used to perform airdrops over friendly areas. In this fashion a country can assign a number of IPCs to a specific bomber. This takes some risk so a die is rolled to determine if the air drop was a succes or not.