1. Ensure that 3rd person is enabled in options.
2. Place any armed UV (MQ4A Greyhawk, AR-2 Darter or UGV Stomper RCWS).
3. Connect to the UV.
4. Take control of UV.
5. While still in control of UV, select Take turret controls.
6. Then select Release controls.
7. You will end up back at your character, with your sights up. (Already in third person here).
8. Right click to go out of your sights.
9. Notice you're now in third person.