During the Cold War in the 1950s, the lifeguard station on Baltimore Avenue in Rehoboth Beach was used as a Ground Observer Corps station. There was a sound detection device mounted on a pole in back of the building. It was used to detect the sound of aircraft flying in from the ocean.
There were pictures of different kinds of airplanes posted on the wall inside so you could identify the planes. My brother Ray and I were volunteers at the station.
The Ground Observer Corps was a defense system to identify possible enemy aircraft. When an airplane was detected flying in over the ocean, we would spot it with binoculars, call in its direction, altitude, how many engines and the type of plane, if possible. There was a call center in New Jersey.
That is the way the lifeguard station was being used before the summer season began.