What's funny about that is the FAA REQUIRES manned ARFF at ALL times on an active air field that falls into their classification system. It's been a few years since I've had a class on this so I'm going to do my best. Centennial is classified on an airport scale based off of the type and size of aircraft that land there. This classification number then translates to amount of water and time that water arrives on scene of a crash. It says nothing about number of personnel needed to respond, but does state that if the water and/or time is depleated (as in 35's running a call and not staffing the rigs) then that airport MUST derate its classification to fit what's available. In short, as the responders leave, the size and type of planes that are allowed to land decreases. In SMFRs case, as soon as they leave, Centennial should, by all rights, close its doors to air ops until the water/time ratio can be reestablished. Goes to show what money can do, huh??? Something weird there. Another interesting note is DIA only runs its ARFF rigs w/ 2 people! FAA says nothing about manpower, just water/time. Make ya feel safe?