"This was a very tough deployment," one sailor told ABC News.
The U.S. Marine who went missing during a training exercise off the coast of Southern California has been declared dead, authorities announced on Monday.
Hours before Monday's attack police were racing to find the two teenagers who would ultimately be deemed responsible.
Two teenage gunmen opened fire at an Islamic Center in San Diego and killed three men before killing themselves a few blocks away, police said.
Three federal officers were injured after a man, who ICE said is in the country illegally, allegedly rammed his car into their vehicles.
Parents of a U.S. Marine were detained by federal immigration officials and one of them was later deported after visiting family members at Camp Pendleton.