 The success of these parties led to the decision to form the Royal Naval Commandos and over the course of 1942–43 personnel were selected and training undertaken at HMS "Armadillo" at Ardentinny and then later at the commando school at Achnacarry in Scotland.In the end 22 Royal Naval Commando units were raised, designated 'A' through to 'W' (although there was no 'I' Commando), each with its own distinctively coloured lanyard worn on the left shoulder when wearing general British army battledress.Of note, ‘W’ Commando was largely formed from personnel drawn from the Royal Canadian Navy.