She was then selected to be assistant to Frank Birch, the head of the naval section in Hut 4, which was known as the "U-boat room", and regularly liaised with the Admiralty's Operational Intelligence Centre in London.
She was then selected to be assistant to Frank Birch, who was serving as the head of the naval section in Hut 4, which was known as the "U-boat room". Cooper would also regularly liaise with the Admiralty's Operational Intelligence Centre in London.