The President of the United States of America takes pleasure in presenting the Silver Star to Captain Gregg Lee Gammack (MCSN: 0-89587), United States Marine Corps, for conspicuous gallantry and intrepidity in action while serving with Marine Medium Helicopter Squadron THREE HUNDRED SIXTY-ONE (HMM-361), Marine Aircraft Group Sixteen, FIRST Marine Aircraft Wing, in connection with combat operations against insurgent communist (Viet Cong) forces in the Republic of Vietnam. Early in the afternoon on 10 May 1967, as Aircraft Commander of a medical evacuation helicopter, Captain Gammack launched on an emergency mission to evacuate a critically wounded Marine from an unsecured zone in hostile territory. Upon arriving in the area with an armed escort helicopter, he contacted the ground unit and was informed that although the landing zone was under fire an air strike was impossible because of scattered friendly positions. Fully aware of the danger involved, Captain Gammack fearlessly commenced his approach and, utilizing terrain features as protective covering, skillfully maneuvered his aircraft into the zone. Although his helicopter came under heavy enemy automatic weapons fire and sustained severe damage, he continued his approach, aborting his landing only after learning from the ground commander that the casualty had succumbed to his wounds. Skillfully controlling his damaged aircraft and completing an evacuation mission en route, Captain Gammack returned to Marble Mountain Air Facility where he obtained another helicopter. Later in the day, he returned to the site of his first mission where the heavily engaged ground forces had sustained nine casualties requiring immediate medical evacuation. With exceptional aeronautical skill and determination, Captain Gammack landed his aircraft and had embarked three of the wounded Marines when the landing zone came under extremely heavy enemy automatic weapons fire. Despite numerous rounds which hit the aircraft, he calmly directed the loading of the seriously wounded casualties. Deeply concerned for the welfare of his passengers and the security of his aircraft as enemy fire grew in volume, Captain Gammack expertly maneuvered his badly damaged helicopter out of the zone and proceeded to the nearest medical facility. Displaying exceptional perseverance and determination, he returned in another aircraft to the besieged zone to complete the medical evacuation. Unable to enter the zone while air strike missions were in progress, Captain Gammack was diverted to an adjacent area to evacuate another critically wounded Marine. Without hesitation, he proceeded to the designated area, skillfully approached the zone and landed his aircraft under heavy enemy fire. While his crew directed fire at enemy positions, Captain Gammack embarked the casualty and was lifting out of the zone when his aircraft was severely damaged by a heavy volume of fire which seriously wounded the crew chief. Exhibiting the highest degree of aeronautical skill, Captain Gammack maintained control of his aircraft, carefully maneuvering it out of the hostile area and landing safely in a nearby secure area. His resolute courage and steadfast determination despite great personal risk were instrumental in the successful completion of the hazardous missions. By his exceptional professional skill, bold initiative and selfless devotion to duty, Captain Gammack upheld the highest traditions of the Marine Corps and of the United States Naval Service.