As the Allies advanced following the invasion of Normandy in June 1944, the "Luftwaffe" pulled bases back to keep them from being overrun. Units of the "Seenotdienst" whose areas of operation were threatened by Allied activity were disbanded or reorganized into other groups with safer locations. For instance, in July 1944, surrounded by the U.S. VIII Corps gathering to attack Brest, "Seenotstaffel 1" that had been operating there since June 1940, with a southern detachment at Hourtin, was sent to Pillau in the Baltic Sea, then redesignated "Seenotstaffel 60" in August. In November 1944, German leadership decided that the flying boat manufacturing resources could be put to better use elsewhere, and ordered the Dornier factory to cease making Do 24s.