The turret rotates, and the gun can go up and down as well.
Note the spare track links on both sides of the driver's compartment.
The orange hatch on the back lifts up, as well.
So here's an interior shot; Discount Robocop and The Captain are kind of difficult to see due to the lighting. The orange hatch has been removed so the Gunner can be in the frame. (All 8 minifigs in the vehicle, in one photo)
And a cutaway side-shot; just to be on the safe side.
The squad, from left to right:
Vehicle Operators, from left to right:
I'm working on a Mechanized Infantry Squad with a different theme, but it wouldn't have been done by the time the AW opened.
I didn't want to be 'frozen out' of the first Attack Window due to not having a Mechanized Infantry.
General Sanister, your Mechanized Infantry Squad is specifications-accurate and ready to roll on turn 1. Good luck in the coming maelstrom of hate! Don't forget to update your ORBAT before the opening of the first Attack Window.