■Five U.S. Marines killed in a helicopter crash during stormy weather.

■Recovery efforts are being hampered by snowfall from a historic storm.

■The military is investigating the cause of the crash.

SAN DIEGO — Efforts were underway Thursday to recover the remains of five U.S. Marines who were killed when their helicopter went down during stormy weather in the mountains outside of San Diego, the military said.

Authorities say the CH-53E Super Stallion vanished late Tuesday night while conducting a flight training on their way back to Marine Corps Air Station Miramar in San Diego from Creech Air Force Base, northwest of Las Vegas.

Statement from the Military

“It is with a heavy heart and profound sadness that I share the loss of five outstanding Marines from 3d Marine Aircraft Wing and the “Flying Tigers,” Maj. Gen. Michael J. Borgschulte, commander of 3rd Marine Aircraft Wing, said in a statement.

Per military policy, the names of the Marines are not released until 24 hours after all next-of-kin have been notified. The five Marines were assigned to Miramar’s Marine Heavy Helicopter Squadron 361, Marine Aircraft Group 16, 3rd Marine Aircraft Wing at Miramar.

The military is investigating the crash and Capt. Stephanie Leguizamon, spokesperson for the wing, said she had little information beyond the statement, but noted that recovery efforts were being hampered by snowfall from an historic storm that was moving out of California on Thursday.

Challenges in Recovery Efforts

“I do know that it’s cold … I know that’s been a contentious issue” for searchers in reaching the crash site.

Defense Secretary Lloyd Austin expressed his condolences and said his prayers are with the loved ones of these “brave Marines” and said the entire defense department mourns their loss.

“As the Marine Corps investigates this deadly crash, it is yet another reminder that across our nation and the world our selfless service members put their lives on the line every day to keep our country safe,” he said in a statement.

President Joe Biden said in a statement that he and first lady Jill Biden are “heartbroken” to learn of the Marines’ deaths.

“Our service members represent the very best of our nation — and these five Marines were no exception,” Biden said.

Details of the Incident

The last known contact with the Super Stallion — the largest helicopter in the military, and designed to fly in bad weather — was at about 11:30 p.m. Tuesday when waves of downpours and snow were hitting the region, Mike Cornette of the California Department of Forestry and Fire Protection told CBS 8 news. That location was based on a “ping” reported to a Cal Fire dispatch center.

The craft was discovered Wednesday morning near Pine Valley, an hour’s drive from San Diego.

The mountain community is at about 3,700 feet (1,127 meters) in elevation in the Cuyamaca Mountains, an area which saw as much 8 inches (20 centimeters) of accumulating snow within hours Tuesday night and early Wednesday and saw more falling Wednesday night, according to forecasters.

The area includes San Diego County’s second highest mountain, Cuyamaca Peak, at 6,512 feet (1,985 meters), and is also near the Cleveland National Forest, which covers 720 square miles (1,860 square kilometers) with much of it steep, rocky and with limited trails.

Measuring about 99 feet (30 meters) long and weighing up to nearly 35 tons (31,638 kilograms), the CH-53E Super Stallion has been used in combat and other operations around the world for more than three decades, including in Beirut, Somalia, the Persian Gulf, Afghanistan, Iraq and Libya, according to a U.S. Navy website.

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In 2018, four Marines from Miramar died when their Super Stallion crashed near El Centro, near the California-Mexico border, during a training mission. The Marine Corps ruled out pilot error for the accident. The victims’ families later sued two companies they alleged provided a defective part that they blamed for the crash.

In 2005, a Super Stallion went down in a sandstorm in Iraq, killing 31 people on board. The accident, blamed on pilot error, was the single deadliest loss of U.S. troops during the war.

More than 130 are in operation.

Nicknamed the “hurricane maker” because of the downwash from its three engines, the Super Stallion has a range of about 640 miles (1,029 kilometers). It was designed to carry up to 55 troops or about 16 tons (more than 13,000 kilograms) of cargo.

This story has been corrected to show the range for the helicopter is 640 miles (1,029 kilometers), not 50 miles (80 kilometers).