The dramatic rescue of an American aid worker and her Danish colleague in Somalia by Navy commandos was a terrific encore to the killing of Osama bin Laden in Pakistan nine months ago. However, all the White House-driven publicity for both events has helped turn the once-secret SEAL Team 6 into a household term, with likely negative consequences. Although SEAL Team 6 and its official successor, the Naval Special Warfare Development Group, have been around since the 1980s, their missions always were kept secret to shield their members’ identities and protect operational security. Every president since the team’s founding has...