Several photographs showing a day in the life of the Duke of Cambridge's work as a helicopter search and rescue pilot had to be hastily removed from his website amid fears they breached security.
The behind-the-scenes photos were aimed at showing William's daily routine at RAF Valley in Anglesey.
They were released as exclusive content on the Duke and Duchess of Cambridge's website, which features contributions from The Prince of Wales and The Duchess of Cornwall.
But some of the images had to be removed and reissued after an "administrative oversight" meant they had not been properly cleared.
The pictures show a day in the life of William - known at work as Flight Lieutenant Wales - in a variety of scenarios, from planning and doing training on computers, to checking his Sea King helicopter, as well as resting with his colleagues at RAF Valley during "downtime".
A Ministry of Defence spokesman said: "A number of photographs of Flight Lieutenant Wales were taken whilst on duty working as a helicopter search and rescue pilot at RAF Valley on Anglesey, Wales.
"Due to an administrative oversight, these photographs were not properly cleared at RAF Valley and the images showed unclassified MoD user names, passwords and computer screens on a restricted system.
"The passwords and user names shown have now been reset as a precaution and we are satisfied the images do not contravene security regulations.
"All the photos have been now amended and reissued. Media organisations are kindly asked to use these images."
A Clarence House spokeswoman said: "The photos were taken and supplied by the RAF. Any security issues are a matter for the MoD."