A server is a computer connected to the internet that is responsive to incoming data requests.
I've heard reports that there was a server in Benghazi that was being carried there by the US diplomats to secretly pass data to bad people, and that this server was recovered by white hats.
What sounds off to me about the story, is that such a computer would nearly certainly not be a "server". If true, the context of the story is passing data files on a physical data storage unit (possibly within a computer or free-standing external hard drive.) That's a physical transfer of data (like shh here's a memory stick) not a server (here's my www address, the data is stashed on the server, and you can collect the data from anywhere in the world.)
That specific detail, calling something a server you're physically carrying to pass data files, makes me skeptical of the entire report.
There are edge cases where it's possible, but seriously they're wildly improbable edge cases (bad people running their private LAN they plug the server into so a room full of bad people can access the files in parallel). If the report is true, seems more likely that it's not a server and the report got garbled by someone who doesn't know tech terms.
Or perhaps (this just came to me) that someone stole an actual server that was being used in a network (whether the public internet or an internal DoD equivalent), and so that the computer was a server wasn't relevant to how it was going to be used at the destination.