Prince William is following his brother, Prince Harry, into the Household Cavalry's Blues and Royals, Clarence House announced today.
The 24-year-old, who will one day be head of the Armed Forces, will train to be a troop leader in an armoured reconnaissance unit, just like Harry.
He will begin a six-month training course, which his younger sibling is due to finish soon, at Bovington Camp in Dorset after passing out from Sandhurst in December.
Clarence House also outlined plans for crafting second-in-line to the throne William into a future King.
After about a year in the Army, the Prince will spend time with both the RAF and the Royal Navy on "familiarisation attachments".
He will, at this point, carry out public engagements in parallel to his military career and they will become more frequent as he approaches the end of his service.