1942 Mack 125 Type O-4 Facts Class 125 Crash Truck Basics Built to be used by the US Army's Corps of Engineers, this vehicle was designed for aircraft crash, fire, and rescue operations. This versatile vehicle was also capable of fighting structural fires. Crew and Equipment Crew: 4 Firefighters Equipment: CO2 extinguisher Midship mounted mulit-cylinder piston 50-60 GPM pump 300 gallons of water 20 gallons of foam Three 100 foot sections of high pressure hose Roles Crash Fire Rescue History of Goodfellow's 1942 Mack 125 Type O-4 On exhibit at Goodfellow since restoration in 2009, the vehicle is part of the historic firefighting vehicles on display at Goodfellow Air Force Base.