It should raise eyebrows when Democratic presidential candidates, and particularly Sen. Hillary Clinton, say that 18-year-old girls should have to register with Selective Service. When the question came up during Monday’s “YouTube” debate on CNN, all of the candidates who answered—Sen. Christopher Dodd, Sen. Barack Obama, John Edwards, and Mike Gravel—said that they opposed the draft, but if there were one, women should be part of it. Hillary Clinton’s answer was particularly ironic, since her husband Bill Clinton famously avoided military service in the Vietnam era. I am not aware that young Chelsea Clinton, or the daughters of Pres. George...