Along with "WW" assembly ships their were "WW" P-47D Razorback "Formation Monitors". I haven't seen a bubble top yet. Also, they were used in the 5th Emergency Rescue squadron
Nope, as Geo stated.
Smoke marker flares carried beneath the fuselage, and a dinghy pack beneath each wing. Flares were to mark the location for the rescue launch or amphibian aircraft.