"ISIS" is a privately owned contract company that hires out its mercenary soldiers and hires them out to whoever wants soldiers.
Please note: ISIS Inc. Virginia USA amd Washinton DC only employs US citizens.
Here's a list of some of the contracts ISIS, headquartered in Washington DC, has picked up in recent times:
US Army Intelligence Center & Fort Huachuca (USAIC & FH)
Lockheed Martin - Defense Intelligence Agency
Caci, Inc. - US Army Intelligence and Security Command (INSCOM)
Advancia - US Army Intelligence Center (USAIC) – Futures Directorate
General Dynamics - US Army Program Executive Office for Simulation, Training and Instrumentation (PEO-STRI)
Lockheed Martin - North American Aerospace Defense Command (NORAD) / US Northern Command (NORTHCOM)
General Dynamics - US Army Network Enterprise Technology Command (NETCOM)
Sensor Technologies, Inc. - ARMY Communications – Electronics Command (CECOM)
Iraqi Voting Legislator - Iraq Coalition for Peace
BSOM – Wintara Corporation - Afghanistan Personal Security Detail – Site Security
Multi National Forces – Iraq - Department of Defense
Minister of Interior - Kingdom of Saudi Arabia – U.S. Kingdom of Saudi Arabia Embassy
Website source: https://public.isishq.com/public/clients/default.aspx