Captain Richard Sawyer said the soldier was "undoubtedly one of life's true characters".
Never one to hide from the limelight, he was always ready to treat those around him, be it a Private soldier or the Officer Commanding, to one of his impressions or jokes - which invariably resulted in hilarity for all those present. Jamie Webb was constant morale.
Having deployed to Afghanistan previously, he was a committed soldier but it was his unique and loveable personality that makes him unforgettable. It was clear to all how much he enjoyed working with his mates in the Army and how much he loved his family. He will be sorely missed.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."
The company’s recently appointed Chief Executive Dara Khosrowshahi said the breach was made by two individuals outside the company.