While no forcefields are in use yet I remeber from one of my briefings before deploying to Iraq that one of the US's better propaganda efforts was the forcefield idea which in the early part of the insurgency caused attackers to wrap their RPGs in plastic and tape do defeat our "magnetic forcefield". This had the wonderful effect of making the already ill aim of the insurgents with RPGs compounded by the problem that they had just sabotoged the flight trajectories of their own RPGs.

http://savvyskull.com/cblog/index.ph...umours-II.html

I used to have a picture on my computer of captured RPG rounds wrapped in plastic but alas that harddrive crashed.