A lot of these props were done by Salem Abi-Hanna. He's a pretty busy guy, so often what I would ask of him was to design one object, like a bottle or a pan. I would then take that object and modify it's mesh to vary it up and provide different shapes in the background so everything didn't look the same.
The rigging of the gun and the flag was done by me. Modeling was again done by Salem Abi-Hanna.