There are/were Supercomputer manufacturers that you have never heard of because their sole clients are the NSA and/or DOD. It has been a joke, in Supercomputing

There are/were Supercomputer manufacturers that you have never heard of because their sole clients are the NSA and/or DOD. It has been a joke, in Supercomputing circles for some time, that the real top 10 machines are missing from the top 500 list for this very reason.