While inside a vehicle, your character's model is effectively removed from the game,
not placed inside the vehicle. If you want to see a soldier inside the vehicle when a
player enters it, you need to set up a seat. This object also allows the soldier in
the vehicle can be harmed directly by projectiles (vs. dying only when the vehicle itself
blows up, e.g. when driving a tank).
When a seat is added to a PlayerControlObject, it will show the body of the soldier.
The seat
has properties to set the animation or skin pose to use when in the seat.