when did the air force start to phase out buck sgt
The U.S. Air Force title Sergeant (E-4, equivalent to an Army or Marine Corporal and Navy/Coast Guard Petty Officer Third Class), commonly and informally referred to as buck sergeant, was used beginning in October 1967 in the hope that the prestige of being an NCO would increase the re-enlistment rate. The title was phased out again in the 1990s.