...But when the Defense Intelligence Agency saw the manuscript in July and showed it to other spy agencies, reviewers identified more than 200 passages suspected of containing classified information, setting off a scramble by Pentagon officials to stop the book’s distribution....(NYT's)
Suspected? LMAO!!! Either it is classified or it is not. How lame is that?
Not lame at all. Not everything in a Top Secret document is Top Secret. It's actually a mixture of stuff that is anywhere from unclassified to the classification of the document. The amount of time secrecy needs to be maintained can vary. This is why you see redactions when documents are unclassified.
To name a specific example, in the recently leaked stuff on Wikileaks, the list of names of Afghans cooperating with the US is Top Secret forever (and not necessarily the rest of the document they appear in) - the only purpose of unclassifying the names would be to get them or their descendants killed.