• Commanding Officer Major (Acting Lt. Col.) J.P. Phillipps RM [more....].
• Second in Command Captain (Acting Major) R.D. Houghton RM [more....]. 
• When the call for volunteers for the Royal Marine Commando went out to all Royal Marine trained personnel, all ranks of the 8th Argyll and Sutherland Highlanders also became eligible to volunteer as they had been seconded by the Army to the 102nd Brigade RM since the end of 1940.
• By the end of March 1942 the RM Commando had attained the full war establishment of 446 all ranks.
• 5 April 1942. The RM Commando moved to Scotland where it was sub divided into 3 Groups with Commando HQ and 'X Company based at Shiel Bridge Lodge about 3 miles from Dorlin House. Elements from each Company spent time at the Commando Training Depot at Achnacarry.
• It was during this period that an independent detachment was formed and designated as 'T' Company for a special mission. They completed their training at Achnacarry. They had been selected to be part of the crew of HMS Fidelity for raiding operations. In December 1942. HMS Fidelity was torpedoed, sinking with the loss of all the 53 Royal Marine Commandos and other crew on board [more....]. 
• 18 May 1942 Greenock. The RM Commando embarked HMLSI Princess Beatrix arriving Ryde, Isle of Wight, a few days later. From there they were billeted in homes at Shanklin, Sandown and Ventnor.
• 19 August 1942. The RM Commando (it had not been redesignated as 40RM Commando as yet although most post war writers use the new title) took part in the disastrous Dieppe raid. The main force of Canadians suffered worst with over 3,000 casualties, over 900 of whom were killed. Out of the 370 strong force from the RM Commando, 24 all ranks were killed and 76 wounded. The Commanding Officer was amongst the Fallen [Dieppe Cdo. ROH].
• 10 October 1942 formation of a second RM Commando.  Unit designations: 'Royal Marine Commando (A), Royal Marines'; and Royal Marine Commando (B), Royal Marines.' 
• 26 October 1942 Green Berets now part of dress for RM Commando (A).
• 23 November 1942 Royal Marine Commando (A) redesignated as No.40 Royal Marine Commando, Royal Marines. Captain J.C. Manners [more....] promoted Acting Lieutenant Colonel and Commanding Officer.
• 30 December 1942, HMS Fidelity torpedoed off the Azores [more.....].
• 13 June 1943 Commando embarks HMT Derbyshire at Greenock engaged in training using the ship as a base.
• 29 June 1943 HMT Derbyshire joins convoy and Commando informed destination is the Mediterranean.
• 9-10 July 1943 Commando in LCA's join 127 Flotilla for Operation Husky landings at Sicily.
• 17 July 1943 Augusta, Sicily, bombing attack on HMS Queen Emma [more.....].
• 7- 9 September 1943 Messina, Commando embark LCI's for Operation Avalanche landings at Vibo Valentia.
• 3 October 1943 Manfredonia, Commando embark LCI's for Operation Devon landings at Termoli [more.....].
• 12 October 1943 Termoli, Commando embarks LCI's for Molfetta via Manfredonia.
• January 1944 Commando engaged in operations on the Garigliano front in Italy.
• 2 March 1944 Commando arrives at Anzio engaged in operations for most of the month [more....].
• 28 March 1944 Commando returns to Molfetta, Italy..
• 4 May 1944 Bari, Commando embarks for Komiza, Vis.
• 5 May 1944 HQ established at Podselje, Vis.
• 29 May 1944 Burial service for Lt. B.P. Hill RM at Vis Naval Cemetery.
• 2 June 1944 Commando HQ, A, Q, and Y Troops embark LCI at Vis for Operation Flounced at Brac [more....].
• 3 June 1944 Brac, Commanding Officer Lt Col. Manners [more...] killed during Operation Flounced.
• 1 July 1944 Podselje Lt. Col. R.W. Sankey, D.S.C., arrives and assunmes command with effect from 2nd July; Major P.R. Matters, second in command. 
• 6-13 July Operation "XERXES", a training exercise Mljet Island, followed by two others.
• 10 July 1944 Podselje 'S' Troop Boarding party.
• 12 July 1944 Advance party move to Monopoli. 
• 13 July 1944 Commando prepares to move to Monopoli.
• 15 July 1944 Commando embarks on S.S. Lubljana at Vis for Komisa.
• 16 July 1944 0400hrs sets sail arriving at Monopoli Harbour at 2000hrs.
• 17 July 1944 Monopoli, 0840 disembark and unload stores. 0945hrs move off to Camp Area. 
• 18 -30 July 1944 engaged in settling down, administration, and training exercises.
• 31 July 1944 Monopoli, 1st Drill Class commences; 3rd Leave Party leaves for 8th Army Rest Camp at bari, for 7 days leave.
• 1-15 August 1944 Monopoli, commando engaged in unit training and administration. Prepares to move.
• 16 August commando moves to Taranto Station.
• 17 August 1944 Taranto Harbour, commando embarks on S.S. Thistlemuir.
• 19 August 1944 commando arrives Augusta Harbour.
• 19 August 1944 Augusta, 12 noon, Dieppe Memorial Service; 1945hrs set sail for Malta.
• 20 August 1944 arrive Valetta Harbour, Malta, and move to R.N. Rest Camp, Ghajn Tuffieha. Engaged training and administration.
• 7/8 September 1944 Ghajn Tuffieha, Malta, training. Reinforcements arrive 7 officers and 160 OR's.
• 19 September 1944 commando embarks on L.S.T. 35 at Valleta Harbour leaving 1530hrs.
• 21 September 1944 Commando arrives at Bari Docks, Italy, and moves to Monopoli Camp. 
• 24 September 1944 Commando moves to Otranto, Italy, and embarks LCI's for Albania (Sugar Beach and Sarande). Engaged in operations.
• 28 September 1944 Albania Four Spitfires straffed enemy positions. Operations on the ground continue.
• 2 October 1944 commando concentrated Yoke Beach area. Heavy rain.
• 3 October 1944 R.S.R. 75MM guns on Yoke Beach engage Sarande. RAF Fighters straffed Sarande gun positions. Transhipping ammunition from Yoke Beach to forward positions by Dory.
• 4 October 1944 Four RAF rocket firing planes attacked gun sites on Corfu. Large fire started. Enemy patrol engaged by party from 'Q' Troop. Lt. Murphy wounded. 2 R.F. Planes and 2 Fighters attacked enemy gun positions. Destroyer shelled Corfu Coast Artilery gun gun site.
• 5 October 1944 4 R.F. Planes attacked enemy gun positions at Sarande. Partisans report no shipping at Sarande the last 2 nights owing to bombing. Enemy believed using Preveza and Igoumeza for evacuation. Capt. Hiles, S.O.R.E 1 Troop S.M., and 3 O.R.'s recce enemy positions below Pt.261.
• 6 October 1944 demolitions proceeding Corfu gun site. 4 Hurricanes attacked Sarande - Gjaste. Heavy A.A. fire. 
• 8 October 1944 Destroyer shelled Sarande area throughout the morning.
• 9 October 1944 attacked and took Sarande.
• 12 October 1944 'Q' and 'X' Troops took up positions around Sarande; rest of commando embark from Sarande for Sugar Beach.
• 13 October 1944 Lt Col. Sankey D.S.C., R.M., with Intelligence Officer and one section 'A' Troop leave for Corfu. Welcomed by all the people.
• 14 October 1944 March past Brig. Churchill, and Archbishop of Corfu.
• 17 October 1944 Corfu, Lt Col. Sankey D.S.C., R.M., appointed Island Force Commander Corfu. Major P.R. Matters assumed command 40RM Commando. Capt. E.R. Cooper appointed Acting Adjutant. 'Y' Troop occupies area North of the island.
• 18 October 1944 Major P.R. Matters with 'Y' Troop and remainder of 'A' Troop arrive Corfu. 
• 12 November 1944 Commando arrives at Monopoli, Italy, from Corfu.
• December 1944 Commando based at Turi, Italy, engaged in training and adminstration throughout the month.
• 6/7 January 1945 Commando moves to Taranto harbour and embarks for Corfu. Engaged on the island for the rest of the month in Troop patrols, training and adminstration.
• 12 January 1945 HQ established Hotel St George, Corfu Town. Troop dispositions 'A' Troop - Gastouri; 'P' Troop - Dhoukadhes; 'Q' - Kondokali; 'X' Troop -  ; 'S' and 'Y'  Troops - Katameri; 
• 31 January 1945 Commando Parade and Inspection by General Zervas on the promenade at Corfu.
• 22 March 1945 Ravenna, Italy, Commando relieves No.2 Commando, in Sector A1 engaged Line Holding.
• 1 April 1945 Lt. Col. De'Ath D.S.O., R.M. Commanding Officer. The Commando’s final action, Operation Roast at Lake Comacchio, Italy [more.....].
• September 1945 - This month was largely devoted to Admin owing to the amalgamation of 40 and 43 RM Cdos., the sending of drafts to other Bdes and to HOC, and preparations for the final disbandment of the Unit.
• 12 September 1945, 40RM Commando and 43RM Commando were officially amalgamated whilst based at Tichbourne House, Alresford.
• 24 September 1945 the above amalgamated Commando units were redesignated a short while before disbandment as the 'Royal Marine Commando (2 Commando Brigade)'

In the Spring of 1946, 45RM Commando arrived in the Far East to strengthen the only remaining Commando Brigade, 3 Commando Brigade.  In October 1946, after the disbandment of Nos 1 and 5 Army Commando units  (merged as No.1/5 Commando), the Brigade was then redesignated as 3 Commando Brigade Royal Marines.

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