Staff Sergeant Roger A. Porter distinguished himself by extraordinary achievement while participating in aerial flight as a pararescueman at Bien Hoa Air Base, Republic of Vietnam on 21 August 1967.  On that date, Sergeant Porter, a pararescueman aboard an HH-43 helicopter, flew to the aid of a seriously injured pilot who had ejected at low altitude from an A-37 aircraft.  Without hesitation, Sergeant Porter thoroughly determined the extent of the man’s injuries and expertly administered vitally needed first aid treatment.  Sergeant Porter carefully placed the man in a stokes litter and loaded him aboard the rescue helicopter for the flight to a nearby hospital.  During this flight, Sergeant Porter continued his intensive care for the patient, treating him for shock and preventing the man from choking by clearing his air passages.  The professional competence, aerial skill, and devotion to duty displayed by Sergeant Porter reflect great credit upon himself and the United States Air Force.