The charity Help For Heroes has been swamped with donations, leading to its website crashing after Drummer Lee Rigby was murdered while wearing one of its tops.
Help For Heroes offered its thanks for the "extraordinary demonstration of support" which had taken it by surprise.
Posting a statement on its holding page, it said:
Since the sad news emerged that a serving soldier had been murdered in Woolwich, Help for Heroes has been overwhelmed with people spontaneously showing their support for the Armed Forces.
Our website is struggling to cope with this overwhelming reaction from the British public, some of whom are choosing to buy T shirts and hoodies.
This sudden surge of interest in the work we're doing to help the wounded and their families has taken us completely by surprise.
We just want to help, and all funds we receive will be used to provide direct, practical support to those affected by their service to our country.
We ask all our volunteers, fundraisers and donors to remember Lee Rigby's family, colleagues and friends.
Thousands of people have visited our website wishing to donate or to buy H4H T-shirts in an extraordinary demonstration of support and defiance of terrorism.
We are working hard to respond to this level of activity.
Prince William said Tedworth House made him and his brother, Prince Harry, "very, very proud" as he declared the recovery centre officially open.
He said: "It is an enormous pleasure to be here at Tedworth House. This place, and what Help for Heroes and its partners have done here, makes Harry and me very, very proud."
The Duke of Cambridge has arrived at Tedworth House in Wiltshire at the start of his visit to officially open the new Help for Heroes Recovery Centre
Prince William and Prince Harry will officially open the first Help for Heroes recovery centre at Tedworth House
- The centre has the capacity to accommodate 50 residents, 4 families and over 150 day visitors.
- It is designed to support those wounded while serving their country to rebuild every aspect of their life, from the moment they are well enough to leave full time medical care.
Help for Heroes founder Bryn Parry told ITV's Daybreak that it will be "like welcoming part of the team back" when Prince William and Prince Harry officially open one of their four new recovery centres.
The charity is building, equipping and running four centres in Tidworth, Catterick, Colchester and Plymouth to provide ongoing support for wounded, injured and sick service personnel and veterans.
The Duke of Cambridge and Prince Harry will visit Tedworth House in Tidworth later as they offically open the new Help for Heroes Recovery Centre.
The Princes will meet injured service personnel, veterans and their families.
Controversial TV presenter Jeremy Clarkson has decided to put aside his aversion to bicycles to lend his support to Help for Heroes.
The Top Gear front man, who once described cycles as "silly Victorian distractions", is encouraging people to get on their bikes and back the Hero Ride fundraiser.
He said: "I'd like to encourage as many of the great British public as possible to take to their bikes and fundraise in what will be a brilliant day to raise money and also celebrate our heroes."
Taking place on June 2, cyclists from all corners of the country will stage fundraising bike rides, with organisers hoping to raise more than £2 million for Help for Heroes.
A volunteer fundraiser for Help for Heroes has been charged with fraud, after allegedly depositing more than £500,000 intended for the forces' charity into his own account.
Christopher Copeland from Copplestone, Devon faces 15 counts of fraud by false representation and one offence under the Proceeds of Crime Act.
A spokeswoman for the charity said that it was working closely with the police.
"We take a firm stance whenever it appears that funds have been diverted dishonestly from the men and women whose lives we are helping to rebuild" she said.
The Race2Recovery team say they are going through their final checks before setting off on the Dakar Rally in a few hours time.
Captain Tony Harris said: "Having been part of Race2Recovery right from the beginning and having put in so much work, along with the rest of the team, it feels surreal to finally be in Lima and be hours away from revving up on the start line."