"As the responsibility for nurturing bilateral relations shifts to the State Department, the responsibility for security assistance moves to the C.I.A., which operates in Iraq under a separate authority, independent of the military.
Although the United States military is unlikely to return to Iraq, it is possible that military counterterrorism personnel could return, if approved by the president, under C.I.A. authority, just as an elite team of Navy commandos carried out the raid that killed Osama bin Laden under C.I.A. command.
The C.I.A. historically has operated its own strike teams, and it also has the authority to hire indigenous operatives to participate in its counterterrorism missions."