This looks to be the original story.

Soldier unhappy with service at 7-Eleven

"A local soldier, whose story sparked a firestorm of nationwide anger on social media, says a Redmond convenience store clerk denied him service, after he showed his military ID."


7-Eleven's response:

"It's clear that a misunderstanding occurred at a franchised 7-Eleven store. We understand that a customer presented a military ID as a form of identification when buying age-restricted products, and the Franchisee’s store associate could not clearly read the birth date. In this instance, the store associate, by law, was required to ask to see a second form of ID with a birthdate. After the customer's age was verified, the transaction was completed. Serving members of the military, being named a top military-friendly company and employing military veterans are great honors for 7-Eleven.”

[link to www.kiro7.com]

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In response to the official statement the soldier requested that 7-eleven view the stores video to support his version of events.