During "Fleet Problem 20", three destroyers are shown sailing abreast. The are the U.S.S. Aylwin (DD-355), U.S.S. Monaghan (DD-354) and the U.S.S. Dale (DD-353). These are three of the eight Farragut-class destroyers built from 1932-35. All three were at Pearl Harbor in December 7, 1941. The Monaghan was lost in a typhoon in December, 1944 while the other two survived the war and were decommissioned in late 1945 and sold for scrap in 1946. All three were very active during WWII with the Monaghan earning 12 battle stars, the Aylwin 13 and the Dale 14.
Throughout the movie Naval personnel are shown wearing their covers (hats) indoors. In the U.S. Navy covers are only worn indoors if a person is on watch, therefore almost every occurrence in the movie is incorrect.