ARFF vehicles are the main tool in airfield firefighting. In addition, there are a large number of DoD installations, including aircraft hangars and other storage and workplaces where fire protection is provided by foam delivery systems, many of which utilize AFFF as the extinguishment formulation. The DoD is estimated to have more than 6,000 ARFF trucks in its inventory and most of these trucks have been used with AFFF. In ESTCP, we are exploring methodologies to clean these vehicles and foam delivery systems.