DALLAS -- At the Army & Air Force Exchange Service, every day is a tax holiday.While several states are offering back-to-school tax-free weekends, military shoppers can double up on the savings as the Exchange is offering an additional discount to match the local tax savings.Exchanges in the 16 states that are hosting tax holidays will offer a percentage off (equivalent to a local tax rate) select back-to-school items such as clothing, footwear, computers and school supplies. Eligible items vary by state."Shopping tax-free is a benefit military shoppers have earned," said Air Force Chief Master Sgt. Luis Reyes, the Exchange's senior enlisted advisor. "The additional savings during the tax holiday is a way the Exchange says 'thank you' to our service members and their families as they prepare for a new school year."The tax holidays begin July 19 in Alabama and continue until August 24 in Connecticut. Shoppers can check their state's tax website for dates and eligible items. Discount valid in stores only.