Does everyone in the CIA go by a number or code name?

Does everyone in the CIA go by a number or code name?

Lindsay Moran (Former CIA Spy) gives expert video advice on: Do the departments inside the CIA hire certain types of people?; What type of person will the National Clandestine Service hire?; What type of person will the Directorate of Intelligence hire? and more...

No, but we do go by pseudo names within the agency. So for instance, when I would talk to my CIA colleagues, they didn't know me as Lindsay Moran, they knew me as Janice Hadley, which was my name within the agency. This sometimes can lead to confusion too, because most of my colleagues didn't even know my last name, and so they would think of me as Janice Hadley and would call me Hadley, and that was my nick name. It lead to a couple of sticky situations when I would run into colleagues outside the CIA, and they didn't really know how to address me. So that's something that you always sort of have to plan for when you've got two totally different identities, to make sure that when those two lives cross you have some sort of story to explain.