Cap Badge of the Royal Marines
|Active||1943 – present|
|Part of||Naval Service|
|Garrison/HQ||Bickleigh Barracks, Devon|
|Motto(s)||Per Mare Per Terram (By Sea By Land) (Latin)|
|Lt Col Richard Cantrill OBE MC RM|
|Captain-General||HRH The Duke of Edinburgh (Captain-General, Royal Marines)|
Tasked as a Commando unit, 42 Cdo RM is capable of a wide range of operational tasks. Based at Bickleigh Barracks near Plymouth, personnel regularly deploy outside the United Kingdom on operations or training. Whilst 3 Commando Brigade RM are the principal cold weather warfare formation, personnel are capable of operating in a variety of theatres including tropical jungle, desert or mountainous terrain. In the future, 42 Commando will be re-structured to be a specialised, go-to unit for maritime operations – meaning some of the posts within the unit, like heavy weapons specialists, can be reallocated across the Royal Navy.
All personnel will have completed the Commando course at the Commando Training Centre (CTCRM) at Lympstone in Devon, entitling them to wear the green beret, with attached personnel having completed the All Arms Commando Course.
Second World War
No. 42 (Royal Marine) Commando was raised in August 1943, under the command of Lieutenant Colonel R C de M. Leathes from the 1st Royal Marine Battalion, as part of the expansion of the commandos. They were assigned to the 3rd Special Service Brigade and served in India and Burma in 1943–45, including operations in the Arakan and Assam. It took part in the third Arakan campaign and carried out a series of amphibious landings down the Burmese coastline. Including the landings at Myebon and the Battle of Hill 170. It then returned to India to prepare for Operation Zipper the invasion of British Malaya. The war ended before the operation began and the commando was diverted to reoccupy Hong Kong.
Post-Second World War
Following the Second World War 1st, 2nd and 4th commando brigades disbanded leaving only one brigade – the 3rd (40(RM), 42(RM) and 45(RM)). The Commando was involved in operations during the confrontation with Indonesia (Borneo). It was during this tour that the famous Limbang raid was conducted by Lima Company. Throughout the following decade it was based in Singapore at HMS Simbang (RNAS Sembawang).
Return to UK
After the return to the UK, the Commando was deployed to Northern Ireland, the New Hebrides in 1980 and exercised regularly overseas. More recently the Commando has seen operational service in South Georgia, Montserrat in 1995, Iraq and Afghanistan. 
In 1982, following the Argentine invasion of the Falkland Islands, the Commando deployed on Operation Corporate. On 21 May the Commando were Brigade reserve at San Carlos under Lt. Col. Nick Vaux RM. The unit was deployed to seize Mount Kent in a night move by helicopter. By 4 June the unit had moved forward, mostly under cover of darkness, to positions west of high ground overlooking Port Stanley and the last Argentine stronghold. After days of probing reconnaissance, a Brigade assault took place on the night of 11/12 June in which the Commando's task was to secure Mount Harriet on the Brigade right flank. By moonlight and in freezing temperatures, 42 Commando moved undetected through enemy minefields in a 9 km right-flanking movement to surprise the enemy in their rear. Consecutive assaults by "K" and "L" Companies followed, up steep slopes onto company positions. Against strong resistance and continuous artillery bombardment, the Marines prevailed. By first light more than 30 enemy had been killed and over 300 prisoners taken as 42 Commando consolidated on Mount Harriet. 42 Commando suffered two fatalities themselves – one on Mount Harriet and one on Wall Mountain.
In May 2013, 42 Commando took over from 45 Commando as the lead Commando task group and deployed as part of the COUGAR 13 Response Force Task Group exercising in Albania and the Middle East.
The structure of 42 Commando, before April 2017, is as follows:
- 1 Command Company:
- Main HQ
- Tactical HQ
- Reconnaissance Troop
- Signals Troop
- Mortar Troop
- Anti-Tank (AT) Troop
- Medium Machine Gun Troop
- 1 Logistic Company:
- A Echelon 1 (A Ech1)
- A Echelon 2 (A Ech2)
- Forward Repair Team (FRT)
- Regimental Aid Post (RAP)
- B Echelon (B Ech)
- 2 Close Combat Companies :
- Company Headquarters
- 3 Close Combat Troops
- 2 Stand Off Companies
- Company Headquarters
- Heavy Machine Gun Troop
- AT Troop
- 1 Close Combat Troop
- Argenta Gap
- Burma 1943–45
- Dives Crossing
- Djebel Choucha
- Greece 1944–45
- Italy 1943–45
- Landing at Porto San Venere
- Landing in Sicily
- Middle East 1941, 1942, 1944
- Monte Ornito
- Normandy Landing
- North Africa 1941–43
- North-West Europe 1942, 1944–1945
- Norway 1941
- Pursuit to Messina
- St. Nazaire
- Sedjenane 1
- Sicily 1943
- Steamroller Farm
- Syria 1941
- Valli di Comacchio
Commanders have included:
- 1948–1950 Lt. Col. Ian Riches
- 1963–1965 Lt. Col. Ian Gourlay
- 1965–1966 Lt. Col. Peter Whiteley
- 1970–1972 Lt. Col. John Richards
- 1972–1973 Lt. Col. Jeremy Moore
- Oct 75 – Apr 78 Lt Col TJM Wilson RM
- Apr 78 – Jun 80 Lt Col Henry Beverley OBE RM
- Jun 80 – Dec 81 Lt Col CHC Howgill RM
- Dec 81 May 83 Lt Col Nick Vaux DSO RM
- May 83 – Dec 84 Lt Col PT Stevenson MBE RM
- Dec 84 – Oct 86 Lt Col Van Der Horst RM
- Oct 86 – Jun 88 Lt Col RS Tailyour RM
- Jun 88 – Jul 90 Lt Col David Pennefather RM
- Jul 90 – Jul 92 Lt Col NM Robinson RM
- Jul 92 – May 94 Lt Col Robert Fulton RM
- May 94 – May 96 Lt Col AR Pillar RM
- May 96 – May 98 Lt Col RGT Lane RM
- May 98 – Dec 99 Lt Col RM Bowkett RM
- Dec 99 – Apr 01 Lt Col Andy Salmon RM
- Apr 01 – Nov 02 Lt Col DA Hook OBE RM
- Nov 02 – Jul 04 Lt Col Buster Howes OBE RM
- Jul 04 – Mar 06 Lt Col GM Salzano MBE RM
- Apr 06 – Jan 08 Lt Col MJ Holmes DSO RM
- Jan 08 – Oct 09 Lt Col CR Stickland OBE RM
- Oct 09 – Jan 12 Lt Col EA Murchison MBE RM
- Jan 12 - Jan 14 Lt Col N Sutherland MBE RM
- Jan 14 - present Lt Col Richard Cantrill OBE MC RM
- "42 Royal Marines to be restructured in line with growing Royal Navy". UK MOD. Retrieved 12 April 2017.
- Haskew, pp.48–49
- Moreman, p.93
- "The Assault on Limbang, Sarawak by 'L' Company Group, 42 Commando, Royal Marines". ARCRE. Retrieved 8 December 2012.
- "Login Required - Once A Marine". Retrieved 31 December 2015.
- "Security Check Required". Retrieved 31 December 2015.
- "Research and collections". Retrieved 31 December 2015.
- "New UK Afghan deployment begins". BBC News. 15 February 2006.
- "Part 46. 42 Commando's approach to and battle for Mount Harriet". Naval History.net. Retrieved 17 April 2016.
- "Mount Harriet, 42 Commando - Falklands War 1982". Retrieved 31 December 2015.
- "Royal Marine - 42 Commando - Iraq". Elite Forces. Retrieved 22 August 2016.
- "Homecoming Parade for 42 Commando Royal Marines". Royal Navy. 7 May 2009. Archived from the original on 15 October 2010. Retrieved 17 April 2016.
- "Royal Marines end cold weather training with three hour battle". Retrieved 31 December 2015.
- "Plymouth marines begin exercise in Albania". Retrieved 31 December 2015.
- "42 Commando launch dawn raid in Oman as part of exercise". Retrieved 31 December 2015.
- "42 Commando". Elite Forces. Retrieved 24 January 2017.
- Moreman, p.94
- Chappell, Mike (1996). Army Commandos 1940–1945. Osprey Publishing. ISBN 1-85532-579-9.
- Haskew, Michael E (2007). Encyclopaedia of Elite Forces in the Second World War. Pen and Sword. ISBN 978-1-84415-577-4.
- Miller, Russell (1981). The Commandos. Time-Life Books. ISBN 0-8094-3399-0.
- Moreman, Timothy Robert (2006). British Commandos 1940–46. Osprey Publishing. ISBN 1-84176-986-X.