1-I would try and hi-jack some of the US vehicles and use them against them.

2-IED's are just land mines to me and they could be exploited a lot further than they have been without having to use any type of remote or electronic ignition.

3-Animal/insect delivered bio-agent.

4-Scorched earth/ burn the place down since I couldn't get out alive.

5-A lot of off the shelf security technology could be altered/used to give me some of the same benefits you would have.

6-Hand held guided missiles that could be built locally, pretty much by hand.