I entered <452nd. Bombardment Group> and tracked to caption reading " U.S.AirForces Table of Organization" This provided a history of the development and experiences of the B-29 bomber. It did not give a direct reference to the 452nd BG or the 728th. Squadron that I could spot. There were "close" references. It may be that the unit never saw combat, as most of the B-29s came on line late in the war, and most/many never were involved in combat. Try entering the logistics you provided, and perhaps you will strike gold. Hope this helps. With best regards, LFT.