Of course even traitors can be remembered for prior service. Benedict Arnold comes to mind. Ever see have the occasion to see his honor?
You can make an excellent case that Benedict Arnold was the single most important factor in winning the most important battle of the Revolution, Saratoga, which led directly to French intervention and therefore to independence.
He was probably the best general on either side in the war. (Actually, on both sides.) He missed, by about 15 minutes, capturing T. Jefferson, the governor of VA, during a raid. Tom’s war record was, shall we say, less than inspiring.