Vice Adm. Matthew Nathan, surgeon general of the Navy, visits with Andrew Knudson and presents him with a coin. Knudson was training in Navy dentistry when he became ill and plans to complete his training after he recovers. Nathan visited with wounded Marines, Sailors, and the staff of Naval Health Clinic Corpus Christi Detachment at the San Antonio Military Medical Center, Sept. 13, prior to visiting and encouraging Knudson.