In a shock-and-awe attack heard across coastal North County, the Navy and Marines launched an hour-long amphibious assault landing at Camp Pendleton Saturday in a brawny celebration of the service.

With nine warships taking position off the coast, helicopters advanced toward Camp Pendleton, Marines parachuted toward land and Navy SEALS stormed ashore.

Explosions shook Red Beach — which is located close to Interstate 5 — as the huge live-fire demonstration that’s being staged to celebrate the 250th anniversary of the Navy and Marines got underway around 1 p.m. Later, M777 howitzers on Red Beach fired 157 mm shells inland, aimed at the Whiskey Impact Area in a remote part of the base.

The attack drew loud cheers among 15,000 Marines, veterans and dignitaries who watched things unfold on a

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