My Lai Massacre


 * Vietnam War event in which American soldiers massacred inhabitants of My Lai
 * William Calley was the only participant who was convicted
 * Prison sentence was commuted to two years of house arrest
 * Hugh Thompson helped end this event, earning him the Distinguished Flying Cross
 * Colin Powell received a letter about this event
 * Claimed the writer exaggerated it
 * Following it, Ronald Ridenhour wrote letters to Congress asking them to investigate the "Pinkville incident"