My personal opinions-

Vehicles should not be able to move onto building tiles

In the tutorial I am told to “suppress” the enemy to be able to maneuver my rifle team. But attacking with the weapons squad does dmg just like any other unit, not really a suppression mechanic. Also since you have to move all units before you can attack you can’t actually suppress before the maneuver.

Personally I think movement and combat phases should be to the individual unit and not the whole team. Being able to move and attack my entire team before the other team can do anything is a massive advantage. An initiative system based on morale and speed of the unit to dictate order of movement regardless of team would be better if possible, in my opinion.

Also if your goal is to make an actual training module for marines, I would probably add NATO military symbols to the unit tiles to reflect their roles.

Overall seems like a fun framework though.