The Prince of Wales carried out a low-key visit to a maritime special forces unit on Tuesday, an entry in the Court Circular has revealed. Prince William visited the headquarters of the Special Boat Service (SBS), which is the Royal Navy’s answer to the SAS, acting as an elite maritime counterterrorism unit.

While Kensington Palace has not shared any further details about the engagement, William worked with the SBS and the SAS in 2008 as part of his military training to understand different branches of the armed forces. The then 26-year-old Prince spent around ten days in the Caribbean with the force, which was working to combat drug trafficking and piracy in the region. 

HRH Prince William trains with the Royal Navy at Britannia Royal Naval college June 3, 2008 in Dartmouth, England© Getty ImagesWilliam at the Britannia Royal Naval college in 2008