For a short time it was retained for use by USAF in case an aircraft out of Upper Heyford had a problem on departure, the US D of D re-surfacing the main runway and providing H24 fire cover too.
Story I was told many years ago when we used to visit the place for "field training" from Brize, was that the Rissie runway was resurfaced so that US aircraft could access the "medical facility" that some of the hangars could be used for?