sentences:  Flew a few missions against German industries, refineries, and communications during the period May–August 1944, but operated almost solely against strategic targets from August 1944, when conversion to B-17's was completed in March 1945.The 487th also attacked oil refineries in Merseburg, Mannheim, and Dülmen; factories in Nuremberg, Hanover, and Berlin; and marshalling yards in Cologne, Münster, Hamm, and Neumünster.Aided ground forces during the Battle of the Bulge, December 1944-January 1945, and turned again to support and interdictory operations in March 1945 as the Allies crossed the Rhine and made the final thrust into Germany.