Ambrosio Guillen
Staff Sergeant Ambrosio Guillen ( December 7 , 1929 – July 25 , 1953 ) was a United States Marine who was posthumously awarded the Medal of Honor—the United States' highest military award for valor—for his heroic actions and sacrifice of life on July 25 , 1953 , two days before the ceasefire , during the Korean War . 
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