Technical Sergeant Rank Insignia USAF US Air Force Sew-on Patch 5.5 x 4 in. USED
This patch has discolored with age.
Technical sergeant, “tech sgt” or “TSgt” in 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.
Technical Sergeant details courtesy of Wikipedia.