They did however have an A-10 over at Boise fire base that they were testing as a S.E.A.T fire bomber.
It wasn't part of the SEAT program (single engine air tanker).
A number of years ago a group of former A10 drivers tried hard to push the A10 as a tanker platform, but it never took off. Ed Herlik was the driving force behind that effort, and the parent company was Aerotech Ltd.
It was never going to happen.