Where Are the MRAPs?

The U.S. military needs more MRAP (Mine Resistant Ambush Protector) Vehicles since February 2005 and are only now beginning to receive a small number. I would like to document where the hold up is for these life-savers. Is it Congress, the companies themselves, or plain old bureacracy? Now that the military has given Iraq some breathing room, despite Maliki, our troops deserve the best.