From GSA.gov…
By September 30, 2014, agencies need to update their public networks to Internet Protocol Version 6 (IPv6) to comply with Office of Management and Budget (OMB) guidance.
GSA has made available a comprehensive IPv6 SOW Template [DOC, 1.25MB] for agencies to use at no-cost to help achieve a smooth and well-planned transition. GSA encourages each agency to access, customize and leverage the IPv6 SOW for its own needs.