I'm not certain what you mean by "the" Viet Nam Medal of Honor, but here are some statistics:
A total of 246 Medals of Honor were awarded during the Viet Nam War, between 1959 and April 30, 1975. Of these, 154 were awarded posthumously. Soldiers of the Army received the most with 160, followed by 57 to the Marines, 16 to the Navy and the remaining 13 to the Air Force. The first medal of the war was presented to Roger Donlon for rescuing and administering first aid to several wounded soldiers and leading a group against an enemy force. The first African American recipient of the war was Milton L. Olive, III who sacrificed himself to save others by smothering a grenade with his body. Riley L. Pitts was killed after attacking an enemy force with rifle fire and grenades and was the first African American commissioned officer of the war to receive the medal. Thomas Bennett was a conscientious objector who received the medal for his actions as a medic; three chaplains received the medal, including Vincent R. Capodanno, who served with the Marine Corps and was known as the Grunt padre.
I had the honor of knowing and being stationed with one MOH winner, Maj Bernie Fisher. Bernie was an A1E fighter pilot whose primary job was close air support. (For those who don't know what an A1E is, it was a World War II propeller-driven fighter that was used extensively in the early phases of the Viet Nam War for close air support because it flew low and slow and was highly maneuverable.) On March 10, 1966, he led a two-ship element of Skyraiders to the A Shau Valley to support troops in contact with the enemy. Six "Spads" were striking numerous emplacements when the A-1 piloted by Major D. W. "Jump" Myers was hit and forced to crash-land on the airstrip of a CIDG-Special Forces camp. Myers bellied in on the 2,500-foot runway and took cover behind an embankment on the edge of the strip while Fisher directed the rescue effort. Since the closest helicopter was 30 minutes away and the enemy was only 200 yards (180 m) from Myers, Fisher quickly decided to land his two-seat A-1E on the strip and pick up his friend. Under the cover provided by the other A-1s, he landed in the valley, taxied to Myer's position, and loaded the downed airman into the empty seat. Dodging shell holes and debris on the steel-planked runway, Fisher took off safely despite many hits on his aircraft by small-arms fire.
The rescue at A Shau was similar to an event that occurred on August 4, 1944 during World War II. On that date, Captain Richard "Dick" Willsie's P-38 was damaged by flak near Ploieşti, Romania. After both engines failed, Willsie crash-landed but was rescued from capture when Flight Officer Dick Andrews landed his P-38 on the field, squeezed Willsie into the cockpit, and flew back to base. By remarkable coincidence, both Willsie and Andrews were also involved in the A Shau rescue. Willsie was the commanding officer of the 602nd Air Commando Squadron to which Myers was assigned, and Andrews flew top cover during the entire rescue. Bernie had earned a Silver Star the day before while flying support for the same battle. He returned to the United States, and, on January 19, 1967, was awarded the Medal of Honor by President Lyndon B. Johnson.
He retired from the Air Force as a bird Colonel in 1975, and lives in Kuna, Idaho.