Sergeant Basil Marin, a Spanish volunteer attached to 'D' Bn. Layforce, was reported missing 1 June 1941 during operations in Crete, later found to be a prisoner of war.
 
Sources
Casualty Lists  / National Archives files WO417/37.

Gunner John Marsden was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war. 

Private Alexander Martin, 1st Bn. Gloucester Regt.  was reported missing in action on the 17th May 1942 and believed to be a prisoner of war. He died In November whilst still a prisoner of war.

Private Francisco Martinez, a Spanish volunteer attached to 'D' Bn. Layforce, was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war.
 
Sources
Casualty Lists  / National Archives files WO417/39.

Guardsman Thomas Maxwell was wounded during operations in Crete on 2 June 1941 and became a prisoner of war. He died whilst in captivity. Son of Robert and Mary Jane Maxwell, of Kirkconnel, Dumfriesshire.

Lance Corporal William McDuff from Walthamstow, London, was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war since the previous day. Enlisted 3 September 1939.

Rifleman McGeachy was reported missing during operations at Crete on 2 June 1941 and later found to be a prisoner of war at Stalag 4C. 

Sources
Casualty Lists / National Archives file WO417/27.
Prisoners of War Lists / National Archives file WO3921/1.

Private Arthur McGill was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war. 

Gunner McGoldrick from Ashton under Lyne was awarded the Military Medal in recognition of gallant and distinguished service whilst serving as part of the British Expeditionary Force in France. After volunteering for No.3 Commando he took part in Operation Ambassador at Guernsey July 1940.

Private James McKenzie was reported missing in the Middle East 24 November 1941 after Operation Flipper, the raid on Rommel's HQ, later found to be a prisoner of war since 19 November 1941. 

Gunner Donald McLean was reported missing on 2 June 1941 during operations at Crete. He was later found to have been taken prisoner and transported to Stalag 344 in Poland.
 
Sources
Casualty Lists / National Archives file WO417/28.

Gunner William McMurtrie was reported missing believed a prisoner of war on 2 June 1941 during operations at Crete.  Later imprisoned at Stalag 4C in the Sudetenland.
 
Sources
Casualty Lists / National Archives file WO417/28.

• 1943 repatriated to the UK [3].

James Frederick Meiners, a Labourer from Essex, enlisted into the Royal Marines 28 August 1939 later joining 40RM Commando sometime after its formation in 1942. Marine Meiners was captured and a prisoner of war on 3 June 1944 during operations on Brac Island in the Adriatic.

Lance Corporal Arthur Michael was reported prisoner of war during operations at Pothus, Norway (Scissors Force). He was captured on 26 May 1940. He had previously been wrongly reported killed in action.

Lance Corporal Hugh Miles was reported missing 2 June 1941 during operations at Crete. Later found to have been captured and transported to Stalag 4G.
 
Sources
Casualty Lists / National Archives files WO417/27 and WO417/31.

Regimental Sergeant Major John Milligan was reported missing and later a prisoner of war 2 June 1941 during operations in Crete. Post war member of the Commando Association from Ayr.
 
Sources
Casualty Lists / National Archives files WO417/30 and WO417/96.

Prisoner of War aged 23.

Sources
RM Prisoners of War / National Archives file ADM201/111 and WO392/7. 
German Record Cards of British POWs / National Archives file WO416/257/61 (closed until Jan 2024).

Donald Murray Moore, a Fisherman from Lowestoft, enlisted into the Royal Marines on 5 March 1939. He joined 46RM Commando which was formed August 1943. Corporal Moore, 'B' Troop, was captured 11 June 1944 during operations at Rots, France.

19 August 1942 (Lance Corporal) reported missing during Operation Jubilee at Dieppe, France, later found to be a prisoner of war [2][3][4].

• 2 June 1941 Crete, wounded and a prisoner of war [3][4][4a].

Gunner George Mycock was reported missing 2 June 1941 during operations at Crete. Later found to be a prisoner of war. Post war member of the Commando Association.
 
Sources
Casualty Lists / National Archives files WO417/29.

Corporal William Neill was reported missing 2 June 1941 during operations at Crete, later found to be a prisoner of war.
 
Sources
Casualty Lists / National archives files WO417/28 and WO417/29.
Prisoners of War / National Archives file WO392/1 and WO392/11.

John Stanley Nicholls, a Dairyman from Birmingham, enlisted into the Armed Forces 27 June 1940 later volunteering for commando service. Lance Corporal Nicholls, No.6 Commando, was reported missing 19 August 1942 during operations at Dieppe later confirmed wounded and a prisoner of war.

Sergeant Charles Nicol was reported missing 24 November 1941 after Operation Flipper, the raid on Rommel's HQ, later found to be a prisoner of war. 

Sergeant Frank Nolting was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war.

Laurence P.T. O'Donnell from London enlisted in to the Armed Forces on 25 August 1939 later volunteering for the Commandos. Corporal O'Donnell, No.2 Commando 3 Troop, was wounded and taken prisoner on 28 March 1942 after Operation Chariot at St. Nazaire.

Guardsman Robert Parker was reported missing 26 February 1943 in Tunisia, North Africa (Battle for Steamroller Farm), later found to be wounded and a prisoner of war.

• 2 March 1943 reported missing during operations in North Africa, later found to be a prisoner of war in Italy [2][2a].

William Parsons, a Bricklayer from Irvine, Ayrshire, enlisted 16 May 1940, later volunteering for the Commandos. Fusilier Parsons, No.3 Commando, was reported missing 19 August 1942 at Dieppe, France, later being confirmed a prisoner of war.

Private Charles Paxton, 10 Troop, was reported missing on 24 November 1941 after Operation Flipper, the raid on Rommel's HQ in Libya, and later found to be a prisoner of war. He was from Inverness and employed in a local grocery store before enlisting.

Acting Lance Corporal Ernest Reid, 3 Troop, was reported missing during operations in North Africa 2 March 1943, found to have been taken prisoner and later transported to Stalag 4DZ.
 
Sources
Casualty Lists 1939-45 / National Archives files WO417/59; WO417/60.

In 1943 he is reported no longer a prisoner and back in the United Kingdom.

Lance Corporal Harold Roberts, 5 Troop, was one of the commando contingent on board HMS Campbeltown during the raid at St Nazaire in Ma

William Robertson from Edinburgh enlisted on 1 August 1939, civil trade Painter. He later volunteered for the Commandos. Private Robertson, No.7 Commando attached to Layforce, was reported missing later confirmed prisoner of war 20 April 1941 during an operation at Bardia, Cyrenaica, Libya. 

Private Joseph Rodgers was reported wounded and a prisoner of war 19 August 1942 after operations at Dieppe, France. Post war member of the Commando Association from Stalybridge, Cheshire.

Private Andrew Ross was reported missing June 1940. He was later found to be a prisoner of war.

Trooper Thomas Saddler, Middle East Commando, was reported missing 2 June 1941 during operations at Crete, later found to be a prisoner of war.
 
Sources
Casualty Lists / National Archives files WO417/28, WO417/34, and WO417/92 (1945).

Guardsman Reginald Saint was reported missing 2 June 1941 during operations at Crete. Later found to have been captured and transported to Stalag 383.
 
Sources
Casualty Lists / National Archives files WO417/27 and WO417/31.

Private George Salisbury, 1 Troop, was one of the commando contingent embarked on Motor Launch ML 177 for Operation Chariot, the raid at St Nazaire 28 March 1942. Reported missing after the raid, later found to be a prisoner of war.

Rifleman Edward Scott was reported missing during operations at Crete on 2 June 1941 and later found to be a prisoner of war after being captured the previous day.

Leonard Arthur Sherington, a Clerk from London, enlisted 19 May 1940. He later volunteered for the Commandos and was attached to No.3 Commando. Corporal Sherington was wounded 27 December 1941 during operations at Vaagso, Norway.

Corporal David Simpson was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war. He had served in India before the war and was the recipient of the India General Service Medal.

Private Alfred Smith was reported missing 19 August 1942 during operations at Dieppe, later found to be a prisoner of war imprisoned in Poland.

Jack John Smith, a Lancashire Farmer, enlisted into the Royal Marines 7 April 1943. He was reported missing 7 June 1944 later confirmed prisoner of war at Sallenelles from 9th June 1944. Post war member of the Commando Association from Atherton, Manchester.

Gunner Peter Smith, from Glencraig in Fife, was reported missing in 1942 (full date not reported) during operations in the Middle East , later found to be a prisoner of war [1][1a].  He was subsequently killed as a result of aerial bombardment [2][2a].

Arthur Muir Sneddon, a Local Government Servant (Public Assistance) from Broxburn, West Lothian, enlisted 15 August 1940 and subsequently volunteered for the commandos.

Driver Eric Sneesby was reported missing 2 June 1941 during operations in Crete, later found to be a prisoner of war.
 
Sources
Casualty Lists / National Archives file WO417/28, WO417/34, and WO417/96.
Prisoners of War / National Archives file WO392/1.