A pilot from Alabama had just been promoted to major in January and had been deployed less than a week when the refueling aircraft he was aboard crashed in Iraq this week, killing him and five others, his brother-in-law said Saturday.

Alex Klinner, 33, leaves behind three small children: 7-month-old twins and a 2-year-old son, his brother-in-law, James Harrill, said Saturday while confirming his death.

“It’s kind of heartbreaking to say: He was just a really good dad and really loved his family a lot — like a lot,” Harrill said.

Klinner was one of three people killed in the Thursday crash who the U.S. government said were assigned to the 6th Air Refueling Wing at MacDill Air Force Base in Florida and who Alabama Gov. Kay Ivey said were stationed in Birmingham. On Saturday, the U.S. government identified the other two as Capt. Ariana Savino, 31, of Covington, Washington, and Tech. Sgt. Ashley Pruitt, 34, of Bardstown, Kentucky.

Three additional deceased service members on the aircraft were assigned to the 121st Air Refueling Wing at Rickenbacker Air National Guard Base in Columbus, Ohio. They were identified by federal and state officials as Capt. Seth Koval, 38, Capt. Curtis Angst, 30, and Tech. Sgt. Tyler Simmons, 28.

The U.S. government listed Koval from Mooresville, Indiana, while the Ohio National Guard listed his home Stoutsville, Ohio. The Ohio National Guard listed both Angst and Simmons from Columbus, Ohio, while the U.S. government listed Angst as from Wilmington, Ohio.

The aircraft was in “friendly” airspace, supporting operations against Iran, when an unspecified incident involving another aircraft occurred, according to U.S. Central Command. The other plane landed safety, U.S. military officials said.