Argo, OSS could be an abbreviation for Office of Strategic Services...
...or its could be an abbreviation for other stupid stuff, as Ed has observed.
OSS is also an abbreviation for Open Source Software and Operational Support System, among other things.
In this case, OSS is a guy who is a member here.
Why do you feel entitled to take Ed to task for his attempt at humor, which I thought was much funnier than yours? It certainly does not appear that Ed was mocking any branch of military intelligence or special services. Don't you think it's time to quit playing Army? This PM Notice has nothing to do with any sub-branch of the military, and we all know you would be livid is someone posted off-topic stuff in your Reilly tome.