Months later, he was killed in a crash alongside Lieutenant Maxwell Nugent, Warrant Officer Class Two Joseph Laycock and Corporal Alexander Naggs when their MRH-90 Taipan plunged into the sea off the Queensland coast.
The chopper, given the call sign Bushman 83, had been flying in formation with three others for Lindeman Island as part of Exercise Talisman Sabre in July 2023.
Alex Naggs (top L), Maxwell Nugent (top R), Joseph Laycock (bottom L), Danniel Lyon (bottom R). (HANDOUT/DEPARTMENT OF DEFENCE)
His wife Caitland Lyon remembers the terrible moment defence representatives arrived at her door.
"In my mind, it had to be a prank ... there was no way in my mind that this could actually be happening," she told an inquiry into the crash on Wednesday.
When she eventually let them in, they told her the father of their two children was missing, even though they knew there had been a catastrophic impact.
"It would have been easier to be told that the crew was dead ... far less cruel than having us hoping and praying for a miracle that wasn't going to happen," she said.
A few months earlier, Capt Lyon had attended a meeting with defence to discuss an incident at Jervis Bay on NSW's south coast, where an MRH-90 ditched into the sea after an engine failed in March 2023.
The crew had been praised for their handling of the emergency but he did not feel the issue had been rectified and adequate measures had been put in place to prevent a similar incident happening.
"Someone is going to die from this one day," he told the meeting.
Ms Lyon recalled he "definitely didn't feel like he was being heard or that the safety of his crew was being prioritised".
The Taipans were retired two months after the fatal disaster in July, with their service already tarnished with fleet-wide groundings.
Ms Lyon questioned the decision to dissemble and bury the Taipans, saying she could not understand why they were being destroyed when they could be "prime pieces of evidence" for the investigation into the crash.
The Taipans were retired in the months following the crash and previous fleet-wide groundings. (AP PHOTO)
"I don't know what possible reason there could be for such drastic and urgent action by defence," she said.
She echoed other family members about the "constant stonewalling" from Defence about the crash and recovered remains.
"We just have not been given anything and it's hard to determine what is correct and what is rumour, and that's very hard," Ms Lyon said.
After being told she would never get the chance to hear the black box recording, Ms Lyon said she hoped that would change.
The inquiry was told that when she requested the support of a social worker to help tell her young son his father was dead, the assistance never arrived.
The social worker had tried calling the mobile number of her dead husband.
"I found it really atrocious," she said.
Ms Lyon spoke of the pressure she felt coming "from the top" to hold a funeral as soon as possible, with her wish to farewell her husband once remains had been identified described as "holding up the capability of the unit".
She said an army chaplain who had gone to her home told her to think of her future husband and future children in response to her suggestion her husband's funeral be held on Father's Day.
"I hadn't even been able to plan my husband's funeral, and it was incredibly confronting and incredibly dismissive," she said.
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