"McNair"s 1959 6th Fleet deployment was followed by assignment to the 4th Naval District as a Naval Reserve training ship, based at Philadelphia, Penn. On 13 August 1961, the Brandenburg Gate between East and West Berlin was closed and construction on the Berlin Wall was begun by East Germany. As tension in the city, and the world, increased, Allied garrisons were reinforced and ships of the Allied navies stood by to await developments. "McNair"s reserve crew was recalled to active duty and the destroyer again joined the active fleet for operations along the east coast and in the Caribbean. In mid-February, she sailed on her last European deployment, a 5-month cruise to northern European ports. By 7 September, she had resumed her status as a Naval Reserve training ship and had returned her reservist crew to civilian life. In August 1963, she entered the Philadelphia Navy Yard for preinactivation overhaul. Decommissioning there on 30 December, she joined the Philadelphia Group, Atlantic Reserve Fleet.