GCC and Iran are at war with each other and Iraq has been their battlefield for some years, this because the US destroyed the Iraqi forces in 2003, now as Iraq is forced to be neutral this will continue untill the military regains its power, the intelligence agency + all other elements that are needed.
Now that this is starting to calm ^^ since the government is getting more power, the threat increases from ISIS in Syria.
Iraq is building an effective security fence on the border with Syria, US armed UAVs can help with monitoring and attacking targets there
http://www.defence.pk/forums/arab-defence/266883-iraq-begins-work-syria-security-fence.html.
They are alreading doing such operations, they are not in 1 place, they are all over, your talking about Syria maybe, Irq cannot go into Syria.
The Iranian regime also supports some groups in Iraq which are just as bad, only they are not active.
With Iron fist you mean like Saddam, murder an entire village for something he has no evidence of like Dujail. We are not looking forward to return to that era.