The Golden Dome director called out just one piece of technology by name at the Pentagon's first major public event for the homeland missile-defense program this week -- a passive Army sensor the service began building to patch vulnerabilities in its own air-defense network and whose existence commanders had for years played down. Gen. Michael Guetlein pointed to the Army Long Range Persistent Surveillance system, known as ALPS, as part of the capability arrayed at Joint Expeditionary Base Little Creek,...