Conversation so far:
how long does it take to become a tech sergeant in the air force
The average Air Force wide active duty time for promotion to the rank of Technical Sergeant is 12 years.
what do technical sergeants do
Technical Sergeants are qualified to perform highly complex technical duties in addition to providing supervision. In addition, they're responsible for the career development of each subordinate under their supervision.
what else does a technical sergeant do
It is the technical sergeant's responsibility to ensure that all enlisted personnel have the tools, training and support they need to achieve maximum performance and accomplish total mission effectiveness.

Question: what's the rank above them
Self-contained rewrite: what's the rank above technical sergeant