Stonehouse Barracks is home to the headquarters of 3 Commando Brigade Royal Marines and 30 Commando Information Exploitation Group, as well as a number of lodger units.
The divisional structure of the Royal Marines (with divisions based at Chatham, Portsmouth and Plymouth) was dismantled during the Second World War although elements of 41 Commando remained at the barracks after the war. In 1961 the barracks became the home of 43 Commando, a unit which disbanded in 1967, but the barracks accommodated 45 Commando until it moved to RM Condor in 1971. In that year, the barracks became the headquarters of 3 Commando Brigade.