Personnel arrive near the scene where a US Marine MV-22B Osprey crashed near Glamis, California, on June 8.
CNN  — 

Five US Marines died after a military aircraft crashed during a training mission Wednesday near Glamis, California, the US Marine Corps said in a statement Thursday.

Equipment recovery efforts “have begun” and an investigation into the crash involving a MV-22B Osprey is “underway.”

“We mourn the loss of our Marines in this tragic mishap. Our hearts go out to their families and friends as they cope with this tragedy,” Maj. Gen. Bradford J. Gering, commanding general of 3rd Marine Aircraft Wing, said in the statement.

File photo of A MV-22B Osprey tiltrotor aircraft.

The Marine Corps has identified the service members as Cpl. Nathan E. Carlson, 21, of Winnebago, Illinois; Capt. Nicholas P. Losapio, 31, of Rockingham, New Hampshire; Cpl. Seth D. Rasmuson, 21, of Johnson, Wyoming; Lance Cpl. Evan A. Strickland, 19, of Valencia, New Mexico; and Capt. John J. Sax, 33, of Placer, California.

All five members were based at Marine Corps Air Station Camp Pendleton, California, officials said.

“It is with heavy hearts that we mourn the loss of five Marines from the Purple Fox family” Lt. Col. John C. Miller, Commanding Officer of Marine Medium Tiltrotor (VMM) Squadron 364, said in a statement.

“This is an extremely difficult time for VMM-364 and it is hard to express the impact that this loss has had on our squadron and its families. Our primary mission now is taking care of the family members of our fallen Marines,” he added.

A US Navy helicopter also crashed in California on Thursday, injuring one member of the Navy.

A Saturday news release from the Navy said all non-deployed Navy aviation units will conduct a “safety pause” on Monday following the recent crashes.

The safety pause will be conducted “in order to review risk-management practices and conduct training on threat and error-management processes,” according to the release.

Units that are deployed will conduct safety pauses “at the earliest opportunity.”

The move is standard following crashes.

In March, four US service members were killed when the MV-22B Osprey aircraft they were traveling in crashed during NATO training exercises in Norway.

This story has been updated with additional developments.

CNN’s Cheri Mossburg contributed to this report.