From the Public Affairs Office at Joint Base Myer-Henderson Hall:
Please be advised that Joint Base Myer-Henderson Hall will host a special 50-gun “Salute to the Nation” performed by Soldiers of the 3rd U.S. Infantry (The Old Guard) Presidential Salute Battery at high noon on the installation’s Summerall Field Sunday, July 4. This cannon fire may cause some car alarms to go off.
We ask that you please pass this information along to the members of your civic association and residents in your neighborhood. We apologize for any inconvenience this may cause.
Additionally this event is open to the public. You are invited to view this annual 4th of July tradition. Plan to arrive at Summerall Field no later than 11:45 a.m. to witness the Soldiers of the 3rd Infantry Salute Guns Platoon as they render honors to the Nation.
(via RAFOM list) [video embedded above]