Technical sergeant, "tech sgt" or "TSgt" in informal parlance, is the sixth enlisted rank in the U.S. Air Force, just above staff sergeant and below master sergeant. A technical sergeant is a noncommissioned officer and abbreviated as TSgt. Official terms of address are "technical sergeant" or "sergeant", although many use "tech sergeant" in informal situations. Within air force enlisted ranks, promotion to technical sergeant has historically been the second-most difficult rank to achieve and is the most difficult promotion that most career air force members achieve. A staff sergeant must have served at least 23 months in grade to be considered for promotion to technical sergeant. It normally takes 10–12 total years of service to attain this pay grade. Technical sergeants mentor junior enlisted personnel while preparing themselves for promotion to master sergeant, the entry rank of the senior non-commissioned grades. High year of tenure was reduced from 22 to 20 years in the 1990s, back to 22 years for a short time after 2001, and back to 20 years in 2013. It was raised back to 22 years in 2018. Historical promotion rates:
Technical sergeant was a rank in the United States Marine Corps until 1958. From 1941 until 1946, the rank was equivalent to grade 2, ranking with gunnery sergeant and other technical ranks with which it shared its insignia. From 1947 until 1958, the rank was reclassified as E-6 and became the sole rank in this grade. The rank was renamed gunnery sergeant and elevated to E-7 after the reorganization of grades in 1959.
The rank of technical sergeant existed from after World War I until 1948 when the rank was renamed sergeant first class. In 1920 the army combined several battalion/squadron level "staff" NCO ranks, including battalion quartermaster sergeant, battalion supply sergeant, ordnance sergeant, hospital sergeant, three grades of master sergeant, and six additional senior-level technical and specialist ranks into the new technical sergeant rank. In 1944 when rifle squad leaders became staff sergeants, platoon sergeants were promoted to technical sergeants. In 1948 the army renamed technical sergeant as sergeant first class.
