Can you tell us a little more about Christopher Lee’s involvement in WW2?

I know Christopher Lee was in the Finnish military during the Winter War and served tin the British military from 1940-1946 in the North Africa Campaign, invasion of Italy, and the battle of Monte Cassino. While in North Africa, he was attached to the Special Operations Executive and the Long Range Desert Group. He stated that he was attached to the SAS from time to time but was forbidden to discuss former, present, or future operations. What types of operations would he be referring to? Keep up the great work TimeGhost team!