Rescue of Living Child from the Ditch: During the My Lai massacre, Andreotta spotted movement among the bodies piled in the drainage ditch where Charlie Company soldiers had executed dozens of civilians. He waded into the ditch, stepping over the dead and dying, and pulled out a small child who was still alive, clinging to a dead woman believed to be the child's mother. Andreotta carried the boy to the helicopter for evacuation.

Confrontation with American Ground Forces: When pilot Hugh Thompson landed the helicopter between advancing American soldiers and a group of cowering Vietnamese civilians, Andreotta trained the helicopter's weapons on the U.S. soldiers and was prepared to fire if they attempted to harm the civilians. This extraordinary act of threatening to fire on fellow Americans to protect Vietnamese civilians represented the ultimate act of moral courage.

Witnessing the Massacre from the Air: From the helicopter, Andreotta witnessed the systematic killing of unarmed Vietnamese civilians by Charlie Company soldiers. He saw bodies scattered throughout the hamlet, soldiers firing into groups of civilians, and the mass execution at the drainage ditch. His aerial perspective gave him an unobstructed view of the full scope of the atrocity.

Killed in Action Three Weeks After My Lai: Andreotta was killed on April 8, 1968, just 23 days after My Lai, when his helicopter was shot down during a mission near Chu Lai. He was 20 years old. His death meant he was unable to testify during subsequent investigations, though Thompson and Colburn provided detailed accounts of his actions.

Posthumous Soldier's Medal - 30 Year Delay: Andreotta, along with Thompson and Colburn, was not recognized for his heroism at My Lai until 1998, thirty years after the events. The Army initially tried to bury the story and punished Thompson for his intervention. It took three decades for the military to posthumously award Andreotta the Soldier's Medal for heroism not involving conflict with the enemy.

Legacy as Military Ethics Example: Andreotta's actions at My Lai, particularly pulling the living child from the ditch, are now taught at military academies worldwide as an example of moral courage and the duty to disobey unlawful orders. His willingness to risk his own life and career to save Vietnamese civilians represents the standard expected of soldiers confronting war crimes.