"Madsen insists that the group is very large and approximately 1,000 agents and informers are employed by this secret agency within the already secretive NSA."
https://www.rt.com/usa/us-national-security-expanding-under-obama/
"The ACIO is a secret or unacknowledged department of the NSA. It is headquartered in Virginia, but also have personnel in Belgium, India, and Indonesia. They are largely unknown, even to senior directors within the NSA. The ACIO is the lowest profile organization within the entire intelligence community."
https://www.wingmakers.us/wingmakersorig/WingMakersintro.shtml