1958 O-6 Facts O-6 Cardox Basics The O-6 crash and rescue vehicle used an onboard refrigeration system to store its CO2 extinguishing agent at low pressure. Crew and Equipment Crew: 4 Firefighters Equipment: 5,000 pounds of carbon dioxide 1250 lbs per minute CO2 boom Roles Crash and Rescue History The truck on display had been abandoned for years to the New Mexico desert until members of the Holloman AFB, New Mexico Fire Department found and restored it to its past splendor. On exhibit at Goodfellow since restoration in 2004, the vehicle is part of the historic firefighting vehicles on display at Goodfellow Air Force Base.