President Obama will maintain a lid of secrecy on millions of pages of military and intelligence documents that were scheduled to be declassified by the end of the year. The missed deadline spells trouble for the White House's promises to introduce an era of government openness, say advocates, who believe that releasing historical information enforces a key check on government behavior. They cite as an example the abuses by the Central Intelligence Agency during the Cold War, including domestic spying and assassinations of foreign officials, that were publicly outlined in a set of agency documents known as the family jewels." The White House has given the agencies ... an extension beyond Dec. 31 of an undetermined length - possibly years. It will be the third such extension: Clinton granted one in 2000 and Bush granted one in 2003. The documents, dating from World War II to the early 1980s, cover the gamut of foreign relations, intelligence activities, and military operations. The records in question are held by the Central Intelligence Agency; the National Security Agency; the departments of Justice, State, Defense, and Energy; and other security and intelligence agencies. None of the agencies involved responded to requests for comment. Steven Aftergood, a specialist on government secrecy at the Federation of American Scientists in Washington [said] "If binding deadlines can be extended more or less at will, then any new declassification requirements will be similarly subject to doubt or defiance."