Two Marine aviators were killed on Saturday when their AH-1Z Viper went down over Yuma, Arizona. They’re now identified as Maj. Matthew M. Wiegand and Capt. Travis W. Brannon.

Their helicopter crashed during routine training operations tied to the semi-annual Weapons and Tactics Instructor Course held in Yuma, hosted by Marine Aviation Weapons and Tactics Squadron One (MAWTS-1). The cause of the crash remains under investigation.