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United States Air Force 
Technical sergeant, or tech sergeant, is the sixth enlisted rank (E-6) 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 (with no period in official USAF and other military correspondence). Official terms of address are "Technical Sergeant" or "Sergeant", although many use "Tech Sergeant".
Within Air Force enlisted ranks, promotion to technical sergeant has historically been the second-most difficult rank to achieve (only the rank of senior master sergeant, capped by federal law, has lower promotion rates) 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.
United States Army 
Technical sergeant was a rank in the United States Army until 1948. During World War II, it was abbreviated as TSgt. or T/Sgt. The rank was above staff sergeant and below master sergeant. The grade was considered to be grade 2 at the time (the equivalent of an E-6 today). With the addition of the pay grades E-8 and E-9 in 1958, and the addition of a third private grade in 1955, the circa-1948 sergeant first class rank was moved to the E-7 pay grade in 1958. By the old scale, the higher the enlisted rank, the lower the grade number. The highest grade was grade 1, while the lowest grade was grade 7. It was replaced by sergeant first class in 1948.
United States Marine Corps 
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.
See also 
- United States Military Pay
- United States Air Force enlisted rank insignia
- U.S. Army World War II Enlisted Ranks
- U.S. Army Word War I Enlisted Ranks
|United States enlisted ranks|
|Pay Grade →
Branch of Service ↓
|Air Force||AB||Amn||A1C||SrA||SSgt||TSgt||MSgt||SMSgt||CMSgt - CCM - CMSAF|
|Army||PVT||PV2||PFC||SPC - CPL||SGT||SSG||SFC||MSG - 1SG||SGM - CSM - SMA|
|Marine Corps||Pvt||PFC||LCpl||Cpl||Sgt||SSgt||GySgt||MSgt - 1stSgt||MGySgt - SgtMaj - SgtMajMarCor|
|Navy||SR||SA||SN||PO3||PO2||PO1||CPO||SCPO||MCPO - CMDCM - FORCM - FLTCM - MCPON|
|Coast Guard||SR||SA||SN||PO3||PO2||PO1||CPO||SCPO||MCPO - CMC - MCPOCG|