In the 1980s and 1990s, as the Army increasingly transitioned to the Battle Dress Uniform (BDU) in woodland camouflage, the Air Force also followed suit, retaining the USAF versions of the subdued cloth insignia of the previous utility uniform. As the Army began using the first version of the Desert Camouflage Uniform (DCU) at the time of the first Gulf War in 1990, so did the Air Force, followed by its replacement the second iteration of the DCU worn by all branches of the U.S. Armed Forces from the mid-1990s through 2011. In the case of the Air Force, subdued brown insignia on a tan background was worn on the DCU, with the exception of black officer rank insignia for 1st Lieutenants and Lieutenant Colonels.