In my 1994 book on the CIA--Blond Ghost: Ted Shackley and the CIA's Crusades--I named many a CIA person, but most were retired and had no objection to being identified.[My emphasis in boldface.]
"Most"? This would seem to imply that Corn identified some agents, or at least one, in spite of their objections. Is this what he meant? I think so: given the current brouhaha with Valerie Plame's being identified, I can't imagine that Corn would be careless over the phrasing of such a thing right now.