Tammy Duckworth was having the best day of her deployment in Iraq - at the controls of a US Army Black Hawk helicopter - when insurgents launched an attack on the aircraft. Small arms fire peppered her side of the chopper... then a rocket-propelled grenade tore through the fuselage and detonated in her lap. Now a US Senator, she says she wouldn't go back to change anything about the journey that put her in harm's way.