Task: Explanation
Input (English): The 1st Special Air Service Brigade (1st SAS) was a fictional brigade during the Second World War. It was first formed in Cairo in 1941, as part of a deception by Brigadier Dudley Clarke, to play on Italian fears of airborne attacks. Clarke used documents, photographs, news reports and even fake SAS soldiers to plant information about the brigade – he even named the Cairo-based deception department, 'A' Force, to bolster evidence of their existence. Question: In what country was the fictional 1st Special Air Service Brigade formed? Answer: Egypt
Output (English):  It was first formed in Cairo in 1941, as part of a deception by Brigadier Dudley Clarke, to play on Italian fears of airborne attacks.