It is so easy to shut these down without making the perpetrator easily known that the idea is ridiculous. If Iran can commandeer a US military drone, I think that this system is a waste of money.

- An EMP would wipe-out unprotected electronics easily

- Targeted energy weapons could fry sensors or the whole ship - The frequencies it uses can be jammed

- A Barrett .50, on the ground or out of a helicopter, could vaporize one of these

- A seemingly normal airplane could "accidentally" ram it

- A similar airplane could use a net and capture it, leaving no evidence

- Hell, if it flies high enough, its onboard GPS device might self-deactivate due to US law.