The Real Agents of S.H.I.E.L.D.
The TSA is an agency of the U.S. Department of Homeland Security that was created as a response to the 9/11 attacks to make sure nothing like that ever happens again.
A Kelleher
The author is a Transportation Security Officer who has served in the U.S. Army, the U.S. intelligence community, and now works for the TSA. A Kelleher is a pseudonym.