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The search for Erin Corwin has not been classified as a criminal investigation, and there are no suspects or "persons of interests" that have been identified, according to an update released Friday by the San Bernardino County Sheriff's Department.

Corwin, 20, the wife of a Twentynine Palms Marine, was reported missing by her husband, Cpl. Jonathan Corwin, on June 29 after she didn't return from a planned visit to Joshua Tree National Park.

On Thursday, Capt. Dale Mondary said the search was still, "considered a missing person investigation."

Related: Search warrants served in missing woman case

Throughout the week, specialized investigators have been in Twentynine Palms and in and around the park searching and flying the remote areas. The ground search, which had been suspended during the week, will resume through the weekend.

On Thursday, The Naval Criminal Investigative Service confirmed to The Desert Sun that it is assisting the San Bernardino County Sheriff's Department in its investigation.

"We're assisting them as far as some of the more military aspects of the investigation," said Ed Buice, NCIS public affairs officer at Marine Corps Base Quantico in Virginia. "The military world is sometimes very confusing to non-military investigators. We help them connect the dots and find a way through the red tape."

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