D-Fence

Keep the green men away form your fort. It starts to get better around level 5. I played untill level 32. I bought all the barricades, autodefence, and I ended up with 20 gaurds on duty that I didn't even have to shoot anymore. The airstrikes would be the best defense there. It's kind of fun.

http://www.i-am-bored.com/bored_link.cfm?link_id=10781

i got so bored,ive been playin for 5 hours(doin other things as well)
Im at(so far)the 76th level, have 2607 tower guards on duty,196 Com Hubs on duty,30 repair people,and all the barricades and AutoDefences