I'll bite. Do you mean Transportation Security Administration? I am unsure what you are asking.
Guessing - if you are asking about background checks before entering the military, and background investigation for security clearances at all stages of a career in the military, the answer is yes. Not by the TSA.
Security clearance checks will start as early as freshman year if at a SA or ROTC. Clearances are at requirement for officers (unless something has changed).