The wtc7 oddities between towers destruction, who is this man?

Since the recent release of the NIST FOIA, this short clip reveals a person of questionable presence. Who is he? Secret Service Special Agent Bennette who is acting as a liaison of sorts for the Tower 7 lobby after Tower 2 has come down, but when asked his title, he states O.S.T. Quick search of OST, (Office of Secure Transportation) reveals an arm of the Department of Energy responsible for the transportation and security of nuclear and, or "related" materials...

For further reference see their site:
Not some group that changes light bulbs in Federal Buildings...

Curious, if anyone had caught this tidbit, and if indeed this man is indeed, OST. Also, more of this camera operators footage would hopefully make it's way into the fold.