They did however have an A-10 over at Boise fire base that they were testing as a S.E.A.T fire bomber. I was told by on of the program test guys that they had several issues with it. The main one being that once you remove the cannon you have major weight and balance problems to deal with. The other issue he mentioned was that the combination of airflow and engine location caused a lot of over spray from the retardant to become ingested into the engines. It wasn't putting out the engines but it was causing major polishing throughout the the fan and compressor sections of the engines. Fire retardant is gritty and causes erosion in jet engines when ingested.