The RQ-4A Global Hawk drone is a fast unmanned aerial vehicle with excellent visual range and stealth-detection capability.
The Global Hawks can be upgraded to carry two Hellfire missiles to provide close air support to ground troops. However, the drone loses its stealth abilities when it fires.
In High Treason the drone's ammo limit was removed (however it still requires the upgrade to be armed), and it will engage enemy vehicles one at a time on the way to its target destination.
Costs $2500. All Global Hawks are equipped with two Hellfire anti-tank missiles. Effective against vehicles only. Note that stealth capability is lost when firing.