A young U.S. Navy sailor poses in dress uniform outside a private residence, circa 1917. He wears the traditional enlisted "Crackerjack" jumper with black neckerchief and white Dixie cup cap. This photograph is part of an album documenting sailors connected to Mare Island Naval Shipyard, California, during the World War I era, when the base rapidly expanded to train and support the growing wartime Navy. Project: 218551