The agent has worked 'undercover' in several countries.
He went 'undercover' as a drug dealer.
an 'undercover' investigation
(..) to enjoy playing him.. We wanted to convey the idea of a secret agent ... ... look. And the 's silhouette seemed to fit well. That J.F.K. undercover look seemed to be the right one. I was excited when we did that scene because I felt I was actually ... ... acting. I was involved (..)2001 The Matrix Revisited