Two Marines were killed Friday during a training mission in Southern California.
A helicopter carrying just two soldiers went down at the base in Twentynine Palms around 4:30 p.m. They were part of the Third Marine Aircraft Wing - a west coast aviation unit.
The commanding officer has not released their names, but says, "Our hearts go out to the families and friends to the Marines lost in the accident."
CNN reports the Marines have seen a number of deaths during training operations.
In 2012, seven Marines died when two military helicopters collided in midair.
And in 2011, there were at least three deadly incidents involving helicopter crashes.
The soldiers' identities will not be released until 24 hours after their families are notified. The Marine Corps is investigating the cause of the crash.