With a loudmouthed showboater like Joe Wilson as her spouse, it's virtually certain that every reporter and cabbie in DC knew Valerie Phlame was a letter-agency employee.
In addition, the overwhelming majority of letter-agency employees are not clandestine, and in Maryland, DC, and Northern Virginia they don't seem shy about telling folks where they work.
Except Robert Novak, Matt Cooper, Judy Miller, and Walter Pincus.