Chief Warrant Officer Terry M. Thomas, of Baton Rouge, Louisiana, was killed in the crash of the AH-64D Apache Longbow helicopter Tuesday during night gunnery training at the Grafenwoehr Training Area.

Chief Warrant Officer Timothy R. Breneman, 36, of Daytona Beach, Florida, was the pilot in command. He was also killed.

Both men were members of the 1st Armored Division’s 12th Combat Aviation Brigade.

"They haven’t a clue what caused it,” Breneman’s mother, Flo Breneman, told The Daytona Beach News-Journal. “All we know is that the crash killed both pilots. They are having a ceremony at his unit in Illesheim (Germany). He will be buried at Arlington” National Cemetery in Virginia.

Military officials said the crash was under investigation.

Breneman said her son graduated from Mainland High School and become an Army Ranger in 1994 after studying art and photography at Daytona Beach Community College.

“We have all these happy thoughts of things he did as a kid,” she said. “He had a wonderful sense of humor, and no matter what he did, we were proud of him — and there is so much he did.”

In addition to his mother, Breneman is survived by his father, wife and sister.