In the early 50s, before national radar system and satellites, the US surveyed the skies with Operation Skywatch: a million civilian volunteers in rickety towers with binoculars and a telephone, watching for Soviet bombers.
The old way
In the early 50s, before national radar system and satellites, the US surveyed the skies with Operation Skywatch: a million civilian volunteers in rickety towers with binoculars and a telephone, watching for Soviet bombers.