There are a few already here but I don't think we have to worry about having a lot of them any time soon. I think the economy is going to deal a death blow to massive wasted spending on programs like this.
If they do start using more of them I hope they use the helicopter style. They're a lot easier to shoot out of the air.lol
And jammers are very easy to build. All you have to do is findf which frequency they're operating on and jam it.lol