Prompted by the British war cabinet who needed a demonstration of political resolve, the operation was ordered by Admiral John Fieldhouse at Northwood Headquarters and planned by staff at 3 Commando Brigade. Major General Jeremy Moore of the Royal Marines was told to provide a Commando company group for a secret mission. Originally selecting 45 Commando who had recently completed jungle warfare training, the final selection was 42 Commando who had recently been on a winter deployment to Norway. The second-in-command of 42 Commando, Major Guy Sheridan, an experienced mountaineer, was selected to be Landing Force Commander. M Company of 42 Commando, commanded by Captain Chris Nunn, was augmented by specialists from the Reconnaissance Troop, the Support Company, signals and medics; a total of 132 men.