They were sent to one of SOE's commando training centres at Arisaig in Scotland.[12] Warrant Officer Jozef Gabčík (Slovak) and Staff Sergeant Karel Svoboda (cs) (Czech) were chosen to carry out the operation on 28 October 1941 (Czechoslovakia's Independence Day),[3] but Svoboda was replaced by Jan Kubiš (Czech) after he received a head injury during training. This caused delays in the mission as Kubiš had not completed training, nor had the necessary false documents been prepared for him.[13]