Forged in Fire 8x31

In the second part of the Armed Forces Tournament, four U.S. service members redeploy to the forge floor to go head to head in one five-hour battle. Up first it's the Champions Duel where two Forged in Fire winners battle it out. Next, the Sergeants Duel, pits a sergeant from the Army against a sergeant from the Air Force. Which two smiths will come out on top and advance to the final round of the Armed Forces Tournament?