The following documents have been released by the Office of the Secretary of Defense and the Joint Staff. They include all correspondence between members of Congress, and their office.
Congressional Correspondence Logs
Congressional Correspondence Log, 2007 and 2009 [1,011 Pages, 199.6MB]
Congressional Correspondence Log, 2012 [368 Pages, 69.8MB]
All Congressional Correspondence Letters
Incoming congressional correspondence (all Members) February 2009 – July 2009 – Document Release 1 [361 Pages, 192.8MB]
Incoming congressional correspondence (all Members) February 2009 – July 2009 – Document Release 2 [265 Pages, 141.8MB]