From the DFAS website today...
Reserve and Guard members: Your 2013 W-2s are temporarily unavailable in myPay while we update the system to put Combat Zone Tax Exclusion information in the correct location on the form required by recent IRS instructions. Once the update is complete, your W-2s will be made available immediately. We will make sure information on the status of your tax statements is posted to the myPay and DFAS homepages. Thanks for your patience.
Hot off the press from DFAS...
Reserve and Guard members: Your 2013 W-2s are now available in myPay. The Combat Zone Tax Exclusion information has been placed in the correct location as required by recent IRS instructions. You may now view or print your 2013 W-2. We are sorry for any inconvenience this may have caused.