Camp Pendleton Marines to mark July 4 with 21-gun howitzer salute
Starting at noon Monday, the Marines plan to fire one round every five seconds from 105-millimeter howitzers, using blank ammunition.
Depending on the weather, the blasts may be heard up to 50 miles away.
-- Tony Perry in San Diego
Photo: U.S. Army soldiers training with a 105-mm howitzer in Sicily. Credit: Department of Defense