Take a closer look at their stories of service and valor.
Civil War: U.S. Army Sgt.
He received the Medal of Honor for his actions.
World War I: U.S. Army Sgt.
He suffered 21 combat injuries during a surprise German attack while on night duty in France.
Despite the wounds, he managed to protect his fellow soldiers from capture using only a knife.
Johnson was awarded the French Croix de Guerre avec Palme, the countrys highest award for valor.
For his bravery, he was the first African American to be awarded the Navy Cross.
Korean War: U.S. Army Sgt.
Cornelius H. Charlton
Charlton took charge of his platoon when its leader was injured and had to be evacuated.
He died of his wounds and posthumously received the Medal of Honor for his actions.
Vietnam War: Pfc.
Milton Olive III
Olive made the ultimate sacrifice during the Vietnam War to save the lives of his comrades.
He would in 2000 become the first Black secretary of state, nominated by George W. Bush.
He received numerous military awards and decorations, including recognition from over two dozen countries.