Forces News has heard how three Queen's Dragoon Guards troopers tended to casualties during the mass shooting in Las Vegas.
Trooper Woodward, Trooper Finlay and Trooper May tried to help four people who were injured when a man opened fire on a country music festival.
One of the victims they tended to sadly later died.
Personnel from the Welsh Cavalry were on the scene as they were on R&R in Las Vegas following an exercise in Nevada.
An Army spokesperson said:
“We can confirm that a number of serving personnel from 1st The Queen’s Dragoon Guards provided assistance to the wounded following the heinous shooting in Las Vegas. Our thoughts go out to those affected by this terrible act.”
The statement went on to say that three members of the Royal Armoured Corps were involved in the immediate treatment of casualties and the subsequent handover of the wounded to the Las Vegas emergency services.
59 people have been killed and another 515 were hurt after a gunman opened fire on fans at a country music festival. The attack is the worst mass shooting in recent US history.
US SWAT teams who stormed the gunman's room on the 32nd floor of the Mandalay Bay Hotel and Casino skyscraper found he had killed himself after shooting at people at the Route 91 Harvest Festival.
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The authorities say the gunman, identified as Stephen Paddock, 64, from Nevada, had as many as 10 guns with him, including rifles.
There has been no word on a motive for the attack, but the FBI said there was no immediate indication that the massacre was connected to international terrorism.
The Islamic State group has claimed responsibility for the attack and said the gunman was "a soldier" who had converted to Islam months ago, but it provided no evidence to back up the claim.
Paddock had checked into the hotel room on Thursday, authorities said. Police said he was a retiree with no criminal record in the Nevada county where he lived.
Prime Minister Theresa May wrote on Twitter: "The UK's thoughts are with the victims and the emergency services responding to the appalling attack in Las Vegas."
Foreign Secretary Boris Johnson said he was "horrified" by the attack, and that his thoughts were with those caught up in it.
The Foreign Office said it was in contact with authorities in Las Vegas and that it was "ready to help" any British people affected.
A spokeswoman said: "Any British people in Las Vegas should follow the advice of emergency services, and check the Foreign Office travel advice."
In an address to the country, US President Donald Trump called the attack "an act of pure evil" and added: "In moments of tragedy and horror, America comes together as one. And it always has."
Police shut down busy Las Vegas Boulevard, and federal and state authorities converged on the scene of the attack. Interstate 15 was briefly closed, and flights at McCarran International Airport were suspended.
Hospital emergency rooms were filled with the wounded. Ruben Kihuen, a Democrat whose congressional district includes a portion of Las Vegas, visited a hospital were some of the victims were taken and said:
"Literally, every single bed was being used, every single hallway was being used. Every single person there was trying to save a life."
The dead included at least three off-duty police officers from various departments who were attending the concert, authorities said. Two on-duty officers were wounded, one critically, police said.
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Nearly every inch of the Las Vegas Strip is under video surveillance, much of it set up by the casinos to monitor their properties, which could yield a wealth of material for investigators as they try to piece together the attack.
Before Sunday's massacre, the deadliest mass shooting in modern US history took place in June 2016, when a gunman who professed support for Muslim extremist groups opened fire at a gay nightclub in Orlando, Florida, killing 49 people.