[Swordmaker]

SIS has more than one meaning.
Secret Intelligence Service (SIS) - otherwise known as MI6
Special Intelligence Service (SIS) - defunct NAZI-specialist part of FBI,
rolled into CIA

I’ve made the change in the entry and given you credit for both due to greater info. Thanks.

[truthluva]

Q Post seemed to imply SIS(FBI) > C_A - meaning SIS(FBI) is greater than CIA. Q has often implied the NSA is greater than the CIA.

I found a different group that represents SIS. This SIS became part of NSA.

https://en.wikipedia.org/wiki/Signal_Intelligence_Service

The Signal Intelligence Service (SIS) was the United States Army codebreaking division, headquartered at Arlington Hall (former campus of Arlington Hall Junior College for Women, founded 1927 to 1942, on Arlington Boulevard in Arlington, Virginia, across the Potomac River from Washington, D.C.). It was a part of the U.S. Army Signal Corps so secret that outside the office of the Chief Signal officer, it did not officially exist. SIS was an early predecessor to the modern National Security Agency (NSA) and later appropriated by the National Security Council who reappointed the resources into the modern NSA.