When the U.S. military needs a vehicle, it's got to be rugged and tough. You're likely familiar with the HMMWV, also known as the Humvee, which would eventually become the primary "jack-of-all-trades" choice for a light four-wheel-drive military vehicle. But back in the early 1980s, the Humvee program was still in its infancy, and the vehicle that filled this role was based on something you should be equally familiar with: the Chevy K5 Blazer. This heavily-modified, diesel-powered Blazer — built by GM for a U.S. government contract — was known as the M1009 CUCV.