NIST's Recommendations for Protection of CLASSIFIED Data? In NIST Recommendation for Key Management Part 1 Rev 4, It states in Section 1.Intro 


  This NIST Recommendation applies to U.S. government agencies using
  cryptography for the protection of their sensitive, unclassified
  information.


and in Section 1.3Scope


  All cryptographic algorithms currently approved by NIST for the
  protection of unclassified, but sensitive information are in scope.


What are the NIST Recommendations for Protection of sensitive and classified data in terms of Cryptographic primitives


Symmetric Encryption
Asymmetric Encryption
Hash Functions
Suite B has been revised in the light of development of quantum algorithms. Some modifications to ECC standards was in response to the scandal of an apparent weak elliptic curve in the previous standard.

From the NSA IAD website:


  Commercial National Security Algorithm Suite
  
  The Commercial National Security Algorithm Suite (CNSA Suite) will
  provide new algorithms for those customers who are looking for
  mitigations to perform, replacing the current Suite B algorithms.
  
  [..]
  
  Currently, Suite B cryptographic algorithms are specified by the
  National Institute of Standards and Technology (NIST) and are used by
  NSA's Information Assurance Directorate in solutions approved for
  protecting classified and unclassified National Security Systems
  (NSS). Below, we announce preliminary plans for transitioning to
  quantum resistant algorithms.
  
  Background
  
  IAD will initiate a transition to quantum resistant algorithms in the
  not too distant future. Based on experience in deploying Suite B, we
  have determined to start planning and communicating early about the
  upcoming transition to quantum resistant algorithms. Our ultimate goal
  is to provide cost effective security against a potential quantum
  computer.  We are working with partners across the USG, vendors, and
  standards bodies to ensure there is a clear plan for getting a new
  suite of algorithms that are developed in an open and transparent
  manner that will form the foundation of our next Suite of
  cryptographic algorithms.
  
  Until this new suite is developed and products are available
  implementing the quantum resistant suite, we will rely on current
  algorithms. For those partners and vendors that have not yet made the
  transition to Suite B elliptic curve algorithms, we recommend not
  making a significant expenditure to do so at this point but instead to
  prepare for the upcoming quantum resistant algorithm transition.
  
  For those vendors and partners that have already transitioned to Suite
  B, we recognize that this took a great deal of effort on your part,
  and we thank you for your efforts. We look forward to your continued
  support as we work together to improve information security for
  National Security customers against the threat of a quantum computer
  being developed. Unfortunately, the growth of elliptic curve use has
  bumped up against the fact of continued progress in the research on
  quantum computing, which has made it clear that elliptic curve
  cryptography is not the long term solution many once hoped it would
  be.  Thus, we have been obligated to update our strategy.
  
  It is important to note that we aren't asking vendors to stop
  implementing the Suite B algorithms and we aren't asking our national
  security customers to stop using these algorithms.  Rather, we want to
  give more flexibility to vendors and our customers in the present as
  we prepare for a quantum safe future. Where elliptic curve protocols
  are to be used, we prefer Suite B standards be used to the fullest
  extent possible as they have a long history of security evaluation and
  time tested implementation that newer proposals do not yet have.


There are links to documents for implementers and users as well.

https://www.iad.gov/iad/programs/iad-initiatives/cnsa-suite.cfm