Around 1981, a prototype K5 Blazer was used as a testbed for a military CUCV vehicle. Between 1983 and 1987, what is known as the M1009 CUCV was the production military version of the civilian K5. The differences are the lack of an air conditioner. They had an additional leaf spring in the suspension. Instead of the normal 12 V car battery the military version used a hybrid 12/24 volt system. It also had blackout headlights, front mounted brush guard, a rifle rack and special paint jobs. A majority of them are painted olive drab green or in the woodland camouflage pattern. Some M1009s that saw desert use were painted tan. All M1009s are powered with the 6.2 L Diesel engine. Some decommissioned M1009s end up in law enforcement use (for example with the Los Angeles County Sheriff's Department). Some were sold through government auctions. A few are still in use by the National Guard.