The names of the six US service members who died when a military refueling aircraft crashed over Iraq on Thursday have been released.

The Pentagon on Saturday identified the crew members as Maj John “Alex” Klinner, 33, of Auburn, Alabama; Capt Ariana Savino, 31, of Covington, Washington; Tech Sgt Ashley Pruitt, 34, of Bardstown, Kentucky; Capt Seth Koval, 38, of Mooresville, Indiana; Capt Curtis Angst, 30, of Wilmington, Ohio; and Tech Sgt Tyler Simmons, 28, of Columbus, Ohio.

Klinner’s family said that he had recently been promoted to major and been deployed less than a week. His brother-in-law, James Harrill, said Klinner leaves behind three small children: seven-month-old twins and a two-year-old son.

“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 told the ᴀssociated Press.

“Over the past 24 hours my family has experienced an unimaginable loss,” Harrill said in a post on Instagram. “He was the kind of man who made everyone around him feel steady and safe. A devoted husband, an incredible father, and someone who lived with a quiet strength and humility that is hard to put into words.”

He added: “The grief is deep, but so is the pride. Alex served his country with courage and conviction, and the way he loved his family was even more extraordinary.”

In a statement obtained by WCMH-TV in Columbus, Simmons’s family said it was saddened beyond measure to hear of the fatal crash.

“Tyler’s smile could light up any room, his strong presence would fill it. His parents, grandparents, family and friends are grief stricken for the loss of life,” they said.

The Ohio air national guard’s 121st air refueling wing said in a Facebook post that three of the ᴅᴇᴀᴅ were service members who served in the Columbus-based unit.

“We share in the sorrow of their loved ones, and we must not forget the valuable contributions these Airmen made to their country and the impact they have left on our organization,” the post said.

The Pentagon has said the loss of the KC-135 Stratotanker was not caused by hostile or friendly fire.

US Central Command, which oversees the Middle East, has said the crash occurred in western Iraq on Thursday following an unspecified incident involving two aircraft in “friendly airspace”. The other tanker involved in the incident landed safely in Israel.

The crash brings the US death toll in Operation Epic Fury to at least 13 service members, with the seven others killed in combat. About 140 US service members have been injured, including eight severely, the Pentagon said earlier this week.

Defense secretary Pete Hegseth described the lost air crew as heroes.