From the White House Down Facebook Page:
On Independence Day, to thank America’s troops for their sacrifice and service, active military personnel and veterans will be admitted with one guest to see Columbia Pictures’ White House Down for free at any participating Regal Entertainment Group, AMC Theatres, Cinemark Theatres, Carmike Cinemas theater or other participating theater by showing proper military identification. Please check your local theater for participation. The special invitation to America’s military personnel and veterans is valid only on the 4th of July and seating is available on a first-come, first-served basis at each participating location.
Click on link below (their FB page) for more info.