The United States enters World War II in December of 1941. As in World War I, the U.S. military and the Coast Guard assume overall control of the port security, with the Customs Service, Immigration and Naturalization Service and the State Department maintaining port operations.
Non-uniformed women had been employed at lighthouses and ports of entry since the 19th Century. After the December 7, 1941, attack on Pearl Harbor large numbers of women began joining the federal inspection services at the ports of entry, as the men went into military service.