Ferguson joined the United States Army from Phoenix, Arizona in 1958, and by January 31, 1968 was a chief warrant officer 3 in command of a UH-1 Huey as part of Company C, 227th Aviation Battalion, 1st Cavalry Division (Airmobile).

On that day, Ferguson voluntarily piloted his aircraft through intense enemy fire to rescue the crew and passengers of a downed helicopter in Huế, South Vietnam.

[7] Chief Warrant Officer Ferguson's official Medal of Honor citation reads: For conspicuous gallantry and intrepidity in action at the risk of his life above and beyond the call of duty.

Despite warnings from all aircraft to stay clear of the area due to heavy antiaircraft fire, CWO Ferguson began a low-level flight at maximum airspeed along the Perfume River toward the tiny, isolated South Vietnamese Army compound in which the crash survivors had taken refuge.

Although the helicopter was severely damaged by mortar fragments during the loading of the wounded, CWO Ferguson disregarded the damage and, taking off through the continuing hail of mortar fire, he flew his crippled aircraft on the return route through the rain of fire that he had experienced earlier and safely returned his wounded passengers to friendly control.