Dear DT, how about the following:
Train platform guns with 3d gunners (not those ‘remote-controlled’ Flak 30s)
New damage model for train boxcars, so that, when destroyed, they don’t look like a string of crumpled cardboard milk boxes
US PT (Patrol-Torpedo) boats - like the one commanded by JFK himself (PT-109) – which were heavily engaged in the Solomons
generic Japanese cruiser
British AA heavy gun (3.7 inch perhaps),
French Char B1bis tank (or similar)
German light reconnaissance vehicle, like Sdkfz 222
A column of generic allied trucks which don’t have U.S. white stars all over them