1955- America's radar fence of the Arctic the Distant Early Warning System (DEW Line) was just in the planning stages. To warn of a Russian bomber attack we relied on a hodge-podge of radar and anti-aircraft defenses. This ad shows a mobile AAA (anti-aircraft artillery) using radar to blast away at very high fast moving jet bombers. Not very effective. The Cold War was a constant chess game of technology planned or deployed, see-sawing back and forth.