1st Lieutenant Rank is the 18th rank in the United States Airforce. First Lieutenant, abbreviated 1st L, is a commissioned officer and ranks below Captain and above Second Lieutenant. This is the second-lowest officer rank in the Air Force and is typically promoted from the 2nd Lieutenant rank. One silver-colored bar of the same type and shape as for a captain. This rank is uniform ready with a pin & clutch holding it in from the back. Sold in pairs and is an official US metal collar rank.