Steve was unmasked in 2001 for sure. There was a series dealing with the 9/11 attacks and at one point Steve is on TV and is all "America didn't kill this guy *remove mask* I did"
Now whether anyone knew before then and he was just making a point or whether that was an official unmasking, I don't know.
In the Secret War trade paperback I have (which is about Nick Fury being stupid, not the Beyonder)the SHIELD notes say Captain America's identity status is public, and the trade is came out in 2005 and I think it's collecting a story for 2004-ish.
So my guess is that at least 2001- on Steve was known as Cap, before that no idea at all.
no subject
Now whether anyone knew before then and he was just making a point or whether that was an official unmasking, I don't know.
In the Secret War trade paperback I have (which is about Nick Fury being stupid, not the Beyonder)the SHIELD notes say Captain America's identity status is public, and the trade is came out in 2005 and I think it's collecting a story for 2004-ish.
So my guess is that at least 2001- on Steve was known as Cap, before that no idea at all.