after the UAV is given the support waypoint it lands at an airfield, when the UAV is landing there is no way to regain control of the UAV,( there is a barely visible icon in the middle of the screen saying stop but I haven found any way to stop the landing autopilot in this case.

when the UAV is landed, the UAV shuts down and player control is restored, if you take off, and give the UAV a loiter waypoint the UAV ignores this waypoint and continues on a heading of SW, until out of fuel, The UAV is controllable by the player, but waypoints are ignored