Great Lakes other lakes as "the lower lakes", because they are farther south. Sailors of bulk freighters transferring cargoes from Lake Superior and northern Lake Michigan and Lake Huron to ports on Lake Erie or Ontario commonly refer to the latter as the lower lakes and Lakes Michigan, Huron, and Superior as the upper lakes. This corresponds to thinking of Lakes Erie and Ontario as "down south" and the others as "up north". Vessels sailing north on Lake Michigan are considered "upbound" even though they are sailing toward its effluent current. Lakes Huron and Michigan are sometimes considered a single lake, called
Naval Station Great Lakes opened. The policy of segregation led to small service school classes with only four or five students in a class. By 1944 Great Lakes began to integrate training and all training was integrated by mid-1945. The Golden Thirteen were commissioned in March 1944 after training at Great Lakes. Four million served on active duty in the Navy during World War II. Over one million sailors were trained at Great Lakes. In 1948, a boot camp for WAVES (female recruits) opened at Great Lakes, first graduating 5 October 1948. In 1951, female recruit training left Great Lakes for United States Naval