Aiming Weapon at Fellow American Soldiers: When pilot Hugh Thompson landed the helicopter between American soldiers and Vietnamese civilians, 18-year-old Colburn aimed his M60 door gun at the U.S. troops and was ordered by Thompson to fire if the Americans attempted to harm the civilians. This act of training a weapon on fellow soldiers to protect enemy civilians was virtually unprecedented in American military history.

Witnessing the My Lai Massacre: From his position as door gunner, Colburn witnessed the systematic killing of unarmed Vietnamese civilians by Charlie Company. He saw soldiers firing into groups of women, children, and elderly villagers, and observed the mass execution at the drainage ditch where Andreotta later rescued a living child.

Ostracism and Death Threats After My Lai: After the My Lai massacre became public, Colburn, Thompson, and Andreotta's families received death threats and were ostracized by other soldiers and portions of the American public who viewed them as traitors for intervening against fellow troops. Colburn described being called a traitor and receiving threatening correspondence.

Thirty-Year Delay in Recognition: Colburn was not awarded the Soldier's Medal for his heroism at My Lai until March 6, 1998, thirty years after the event. The Army initially suppressed recognition of Thompson's crew, and it took decades of advocacy before the military acknowledged their moral courage.

Return Visits to Vietnam and Survivor Meetings: Colburn returned to My Lai multiple times after the war, meeting Vietnamese survivors of the massacre. He developed personal relationships with survivors and their families, seeking reconciliation and healing. These visits became a powerful symbol of the possibility of atonement.

Military Ethics Advocacy: After receiving belated recognition, Colburn became a vocal advocate for military ethics education, speaking at military academies and training facilities about the duty to disobey unlawful orders and the moral responsibility of individual soldiers. He used his experience at My Lai to teach future soldiers about moral courage.

Psychological Impact and PTSD: Colburn struggled with post-traumatic stress disorder from his experiences at My Lai and during the broader Vietnam War. The trauma of witnessing mass murder by his own countrymen, combined with the subsequent ostracism, took a severe toll on his mental health for decades.