Useless sentinel drones

[mrCorat]

Sentinel drones doesn't compete in fighting abilities with Humvee. Only one tactics, that this drone can do at least is infiltration tactics for giving information and waiting late game, where researching drone armor and gun can give additional firepower. But this tactics requires spam of this drones for long period, that is not acceptable for USA player by changing Humvee to drone. In this case need to change core game design of this drone (if it realistic). There some ideas for this unit:

1. Laser pointer defense (like in battle chinook)
2. Give weapon from, that uses Colonel Barton.
3. This unit could be built in Command center or Strategic center.
4. Can automatically attack if it will be located.
5. If some buildings was destroyed, this unit would be appeared instead of rangers.