RSM Martin McRae (DCM) is seated here just right of centre in the photo.  He is pictured here with his friends from No. 2 Commando. 

McRae was awarded the Distinguished Conduct Medal for his actions at Cassino on 19 March 1944.  He had discovered a German tank and troops dug into a ruined building and directed New Zealand tanks to fire into the building, leading to the capture of almost 100 prisoners.

No 2 Commando were a Commando unit of the British Army. An elite unit made up of 'picked volunteers' who were selected and trained by officers for battle.  Recruits had to pass through rigorous training to gain entrance.