Main entrance to the Navy Memorial Museum, circa Summer 1978. This entranceway, located between the building's two southern wings, was demolished and rebuilt to another design in 1981-1982. Note the three submarine periscopes located in the Museum's southwestern wing, and the old anchor mounted in front of that wing. Large metal plaque above the Navy Memorial Museum sign identifies the building's previous use, as the Naval Gun Factory's Breech Mechanism Shop. At right is the conning tower fairwater (sail) of USS Balao (SS-285), which was relocated to another part of the Navy Yard in 1982 and again in about the year 2001. This photograph was received by the Naval Photographic Center in January 1979. Official U.S. Navy Photograph.