I think my Grandpa worked on the mentioned classified experiments in the late 1950s and throughout the 1960s. He was a Naval Academy graduate with a degree in electrical engineering and spent several years on submarines. He then spent several years working at the Pentagon in late 50s and throughout the 60s (my mother was born in Bethesda in 72).
He took those secrets to his grave. I could never get it out of him what he did that was classified. Although I did find several books and research papers in his basement about sonar and radio communications…
Anyways, great article that gave me a bit more insight into what my Grandpa might have been up to.