In addition the Royal Marines formed Mobile Naval Base Defence Organisations (MNBDOs) similar to the United States Marine Corps Defense Battalions. One of these took part in the defence of Crete. Royal Marines also served in Malaya and in Singapore, where due to losses they were joined with remnants of the 2nd Battalion of Argyll and Sutherland Highlanders at Tyersall Park to form the "Plymouth Argylls". The Royal Marines formed one Commando (A Commando) which served at Dieppe. One month after Dieppe, most of the 11th Royal Marine Battalion was killed or captured in an ill staged amphibious landing at Tobruk in Operation Agreement. Again, the Marines were involved with the Argyll and Sutherland Highlanders, this time the 1st Battalion. In 1942 the Infantry Battalions of the Royal Marine Division were re-organised as Commandos, joining the British Army Commandos. The Division command structure became a Special Service Brigade command. The support troops became landing craft crew and saw extensive action on D-Day in June 1944.