This was one of the Military Sealift Command's mysterious fleet of "Special Project Ships". She began as one of over 500 Victory-class cargo ships built during WW-II, the SS Kingsport Victory. In 1961 she was converted into a specialized satellite communications ship, I believe the fist ever built. Later, she served as a survey ship, and was finally laid up in 1984.
During the second half of the 1970s, when I was sailed for MSC, the Kingsport was a very unpopular assignment, not because of the ship herself but because of her captain, who had a bad reputation was a notorious martinet. I recall that those who had been working around MSC for any length of time used to try to avoid getting assigned a berth on the Kingsport if at all possible.