A helicopter collision has tragically claimed the lives of seven Marines. The crash occurred Wednesday night near Yuma, Ariz., NBC News reported. The Marines were conducting a training exercise when their aircraft collided in midair. While the cause of the crash is under investigation, military officials have yet to release the names of the dead, but said there were no survivors. The Marines hailed from the 3rd Marine Aircraft Wing based at Miramar in Southern California. The crash occurred around 8 p.m. local time.