Pennridge High School in Perkasie hosted the Marines for a day
The artillery rounds were fired over Interstate 5 near Camp Pendleton in San Diego as part of a military demonstration for the Marine Corps' 250th anniversary.
According to California Highway Patrol, the explosive ordinance that was fired over the freeway detonated overhead prematurely, striking and damaging a patrol vehicle.
Navy and Coast Guard vessels that arrived last week set sail to return to their home ports.
The "Homecoming 250" fireworks show, originally delayed due to weather earlier in the week, drew crowds to both sides of the River for a vibrant celebration of military history and service.
The events culminate with a fireworks show over the Delaware River Wednesday night, and a sendoff for the ships on Thursday.