The Central Intelligence Agency said that it will disclose four previously unacknowledged Cold War covert actions. The four have not yet been publicly identified, but they will be addressed in forthcoming editions of the U.S. State Department’s official Foreign Relations of the United States (FRUS) series.

“In 2015 [CIA] agreed to acknowledge four covert actions that will be documented in future volumes (of FRUS),” according to a new annual report from the State Department Advisory Committee on Historical Diplomatic Documentation for calendar year 2015.

CIA spokesperson Ryan Trapani declined to say what those four covert actions are.

“CA [covert action] programs are not officially declassified until done so by FRUS, so you have to wait for its formal announcement,” Mr. Trapani said by email.

The FRUS series has been a significant driver of the national security declassification program, particularly since a 1991 statute required that FRUS must present a “thorough, accurate, and reliable” documentary history of U.S. foreign relations — which necessarily includes information that was classified at the time — within 30 years of the events in question.

The State Department has never yet complied with that 30 year deadline, but the new Advisory Committee report indicates the situation is improving. “It is likely that HO [the State Department Office of the Historian] will finally meet its statutory thirty-year timeline as it publishes more volumes in the Reagan administration series over the next few years.”

The Committee report was complimentary towards the CIA, citing “the very positive relationship HO has developed with CIA over the past several years [which] has paid dividends. CIA consistently reviews both specific documents and compiled volumes in a timely manner….”

“Nevertheless, the frequent reliance on covert actions in the Reagan and subsequent administrations will doubtless require lengthy declassification processes that will inevitably delay publication of a significant number of volumes beyond the 30-year target,” the report said.

One specific area of disappointment is the failure to release the long-deferred FRUS volume on the 1953 coup in Iran.

“Owing to the currently volatile relationship between the United States and Iran…, the State Department continues to withhold its approval for publishing the eagerly anticipated retrospective volume on Iran 1953,” the Committee report noted.

The status of the Iran volume is expected to be on the agenda of the upcoming meeting of the State Department Advisory Committee on June 6.