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Technical sergeant is the name of one current and two former enlisted ranks in the United States military. ==United States Air Force== Technical Sergeant, commonly shortened to "Tech Sergeant" in a somewhat informal parlance, is the sixth enlisted rank (pay grade 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" in informal situations. 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. 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.〔(High year of tenure changes take effect in 2013 ), Air Force Personnel Center〕 Historical promotion rates: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Technical sergeant」の詳細全文を読む スポンサード リンク
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