Operation Paukenschlag (drumbeat/thunderclap), which Wikipedia likes to call the Second Happy Time, occurred from 1942 January to August. During this time, German U-Boats sank a huge amount of ships on the US East Coast.
During this time, what was the state of US AA defenses on the East Coast? For example, how many AA guns did a city like New York have? How many airfields were nearby and how many aircraft were ready to defend? What kind of aircraft were they and what were their armaments? And crucially, did these AA defenses increase significantly from January to August?
With hindsight, we know that Germany had no possible air power near the US East Coast. But at the time there were fears of an invasion. So I would like to know the state of the US AA defenses on the east coast.