"...Records are accessioned into the National Archives, and become archival, 62 years after the service member's separation from the military. This is a rolling date; hence, the current year, 2011, minus 62 years is 1949. Records with a discharge date of 1949 or after are non-archival and are maintained under the Federal Records Center program. Non-archival records are subject to access restrictions..."
Read more at archives.gov