/// <summary>
/// If all units are invisible, make the platoon invisible.
/// </summary>
private void MaybeTogglePlatoonVisibility()
{
PlatoonBehaviour platoon = _unit.Platoon;
bool visible = !platoon.Units.TrueForAll(
u => !u.VisionComponent.IsVisible);
platoon.ToggleLabelVisibility(visible);
}