The EH101 Merlin PVC badge, otherwise known as the Merlin; and used by the RAF and Royal Marines Commando/Royal Navy.  This is a celebration of the aircraft type, and a moral patch for those whom have flown it or flown in it.  Those who know what 'Going Commando" means will appreciate the saying.  The path has male attachment on the back, securely stitched for removal for washing.