I have received the following info from several sources:
Military Exchange Shopping.
The Army, Air Force and Navy exchange will start allowing all honorably discharged veterans to shop online, (think Amazon, but only cheaper with no taxes.) The target start date is Veterans Day, November 11, 2017, but, you must register first. Registration begins June 1, 2017. You can call 1-844-868-8672, or go to the web site www.vetverify.org after June 1 to register.
A better explanation is available in an article in the Stars and Stripes:
Once you complete the simple form at VetVerify, you’ll receive immediate confirmation of your ability to begin using the online Exchange starting Nov. 11th. If your records don’t match, expect
to have to submit paper evidence of your service.