These are from Flytrap's system Warpod.
These guys are awesome and I wish I had more time with them. They were done express for a convention. They have so much character and are in the same vein as Rivet War, though I have no idea which came first. Warpod looks more WWII, while Rivet War is WWI. Anyways, I digress. There are only a couple pics as I rushed these out the door.