Dr. David Kahn's Donations (2004-present) - Visit the Special Acquisitions Page to see these donations.
Harry Letaw's Donations (PRC 25 Radio, Japanese Battery Case, Codes Manual)
Lou Kruh's Cryptologic Collection
An Eclectic Mix: A collection that illustrates the unusual variety of acquisitions.
Chaocipher Items from the Estate of Inventor John Byrne (includes Machine, Papers, Blueprints, Wooden Mock-Up)