COMSEC isn't an exclusive quality you know, and it's the CIA with the unbreakable code sculpture in its front yard.
Advanced Lab - look up your espionage history and the use of gadgets.
Media Lab - dear god how can you even ask that
Without going into too much depth, I'll quickly shed a little light here. COMSEC is the regulatory standard for the record keeping, safe guarding, destruction and retention of classified material. (COMSEC Custodian, COMSEC LH, COMSEC User, etc. etc.) COMSEC is DoD / DoS / DHS wide. Cryptography / Cryptanalysis is the actual art of creating and deciphering codes. Those are typically handled by one of the two major depts. Sometimes a third.