Sent into combat zones 11 times, Brian O’Rourke now will be battling for veterans’ well-being.A week that Americans started by remembering those who gave all in our country’s service is a fitting time for Special Operations Chief Brian O’Rourke to retire from the Navy. He has been a SEAL for two decades, the last nine years with the elite Naval Special Warfare Development Group—“DevGru,” commonly called SEAL Team Six. It has been a remarkable journey for Mr. O’Rourke, who entered the Naval Academy in 1990, bent on becoming a SEAL. Counselors suggested he switch to a less demanding major than...