User blog comment:Damac1214/Back in Black - Call of Duty: Black Ops III teased, reveal trailer coming April 26th/@comment-5290320-20150410041058/@comment-1055346-20150410154044

Re-watch the first ever Black Ops 1 teaser. Like the very first. A character speaks during the interrogation scenes who seems to be a doctor. The character is never seen in the actual game, but they used one of his lines in this trailer and later used a line from Dr. Salim. I think the implication is that they are the same character and Dr. Salim has been here since the begginning.