I can only speak for the bases that were located in Canada, and Newfoundland.

In the case of Argentia, Newfoundland, the USN operated that base up until the 1990's, as a major supply and repair site for nuclear subs, and surface ships. When the US Government left the site, it left behind 40 years of toxic materials, and hundreds of tons of scrap metal. The Canadian Government has been trying, to no avail, to get the USA to clean up the mess that it left behind.

The same thing took place at Goose Bay, Labrador, and many of the radar sites that made up the "Distant Early Warning " radar line. The USAF had a number of Dew line radar stations in our far northern regions, that were tasked to look for USSR bombers coming over the Polar Sea to attack North America. When satellite technology made the DEW line obsolete, the USAF simply "walked away " and left us to clean it all up.

The only enduring benefit to Canada was the harbour facility built at Argentia , which is now a ferry terminal for the long route from Sydney, Nova Scotia. The airfields at Goose Bay, and Cornerbrook are also still in operation today.

My wife is originally from The Bahamas, and she asked her brother who lives in Nassau about the bases in The Bahamas, and he said that there is still a small USN underwater listening post in Bimini. All the others were closed in the few years after 1945.

The Bimini USN station was staffed by a mixed crew of USN and RCN in the 1950's, into the 70's. How do I know that ? A close personal friend of mine , who was a long time "electronics spook" with the RCN , married my wife's best friend, after meeting her in Bimini at a dance, in 1969.

Here is a list of Canadian Radio intelligence stations and bases, dating from 1939 to the present day.

Note that CF Station ALERT is the most northerly inhabited place in all of Canada. Now adays, CFS ALERT listens to world wide cell phone, internet and radio , microwave, plus ultra low fequency signals from submarines. Canada shares it's sigint with the USA, the UK, and Australia, on a ongoing basis. ALERT is considered to be a " hard ship posting " and the 60 to 70 people up there are rotated every six months.

How do I know ? Don't ask.......

Summary of Canadian Sigint Stations

Jim B.