sentences:  Although Silver Age Hawkman joins the Justice League in "Justice League of America" #31 in 1964, Silver Age Hawkgirl was not offered membership because Justice League rules only allowed for one new member to be admitted at a time.Several years later, Silver Age Hawkgirl joined the Justice League of America with issue #146 in 1977.In 1981, Silver Age Hawkgirl changed her name to Hawkwoman in the Hawkman backup feature of "World's Finest Comics" #272.