united states lightship "relief" (wlv-605) is a lightvessel now serving as a museum ship in oakland, california. built in 1950, she is one of a small number of surviving lightships, and one of an even smaller number built specifically for the united states coast guard. along with her sister ship, the wlv-604 "columbia", she is a good example of the last generation of lightships built. she was declared a national historic landmark in 1989.