Dozens of search and rescue volunteers fanned out from the Scottsdale area on Saturday in search of 37-year-old Jesse Conger.
Joe Osuch from Arizona 4x4 Off Road Recovery said Conger frequented the area near Saguaro Lake.
"He could be anywhere but he liked this area," Osuch said.
It's now going on eight weeks since Conger left his girlfriend's Scottsdale apartment on August 14. Conger's twin sister came in from Utah to support the crews looking for her brother.
Patricia Conger said they're hoping to at least find his car, a newer model silver Toyota Camry with Nevada plates.
"If we find the car then the county search and rescue and police can start looking for him she said. Until we find the car, he's still just a person who drove off."
Conger was in the Marine Corp for 10 years. His sister said he saw a lot of tragedy, between being a search and rescue swimmer and doing three combat tours. His service took a toll mentally.
"He was extremely paranoid in the days leading up to when he left, he was extremely depressed," she said. "We just need to find him."
Conger's service dog also joined in the search. Osuch said they'll go anywhere they have to find him.
"We're not going to stop. He's a veteran, I'm a veteran and like they said in the Army we never leave a man behind," Osuch said.