DALLAS -- The Army & Air Force Exchange Service, along with Procter & Gamble, is commemorating the 50th anniversary of the Vietnam War with an essay contest that provides Vietnam veterans and family members an opportunity to share memories of their local PX/BX experience overseas or back home during the Vietnam War."We invite customers to write essays about how the Exchange provided comfort to our troops and brought a bit of home to their long days during the Vietnam War," said Ray Lamy, the Exchange's military outreach coordinator and retired Air Force major. "Many Exchange customers served in Vietnam or have family members who did."Exchange gift cards totaling $4,000 will be awarded to four winners. One grand-prize winner will receive a $2,000 gift card, one second-place winner will receive a $1,000 gift card and two third-place winners will each receive $500 gift cards.From now until Nov. 21, authorized Exchange customers 18 years or older can submit their essay of 300 words or less by email to patriotfamily@aafes.com. Entries must include full name (including middle initial), mailing address, email address and telephone number.For complete rules and details, visit https://www.shopmyexchange.com/patriot-family.