What is the data classification for information deemed to be National Security Information for the U.S. military, as specified in 2009 by Executive Order 13526?

What will be an ideal response?

The U.S. military uses a three-level classification scheme for information deemed to be National Security Information (NSI), as defined in Executive Order 13526 in 2009. Here are the classifications along with descriptions from the document: 1) "Top Secret" shall be applied to information, the unauthorized disclosure of which reasonably could be expected to cause exceptionally grave damage to the national security that the original classification authority is able to identify or describe. 2) "Secret" shall be applied to information, the unauthorized disclosure of which reasonably could be expected to cause serious damage to the national security that the original classification authority is able to identify or describe. 3) "Confidential" shall be applied to information, the unauthorized disclosure of which reasonably could be expected to cause damage to the national security that the original classification authority is able to identify or describe. ?