I see others have written a large amount of information so I’ll just stick with a short bulletlist of the main go to distros IMHO. (replace Gnome suggestions with XFCE for example if you want more lightweight and classic OS, but not optimized for touch)
- Fedora (with Gnome)
- Manjaro (with Gnome)
- Ubuntu
- Elementary OS
The data point in Iceland about a military base being located here is not correct anymore. There used to be a base at/around Keflavík International Airport, built in WW2 but closed in 2006. Iceland is part of NATO though so there are usually one or two jets from NATO at the airport doing their things. But there’s no base there anymore.
Most of the base has been turned into a village on its own, a movie studio, concert venue, university, etc…
https://en.wikipedia.org/wiki/Naval_Air_Station_Keflavik