You like engineering?
It was part of a US Navy network using high frequency direction finding to locate communist nuke submarines and nuke bombers and locate communist radio/communication stations. When they used morse code to send a message we could find their location usually within 100 yards to pinpoint them. Now days this is all done with satellites and the equipment pictured is long outdated.What does it do?
During the Korean War, Vietnam War, Cold War and Gulf War, MARS was most known for its handling of "Marsgram" written messages and providing "phone patches" to allow overseas servicemen to contact their families at home.