i think the reason America is being left out of the loop. is that Iran and Iraq don't see this as an ISIS problem. but as a Sunni uprising. the American insistence on trying to involve the sunnis against ISIS was unacceptable to the power in Iraq.
http://abcnews.go.com/Politics/us-providing-air-support-iraqi-push-retake-tikrit/story?id=29332144
" A U.S. official told ABC News that this appears to be more of a “tactical operation” and that Iraqi military elements involved do not appear to be well-coordinated.
"We were aware of the operation before it started,” Pentagon spokesman Col. Steve Warren told reporters Monday. “But I’m not going to details about what degree of coordination was involved in this."
Another U.S. official said that the U.S. began monitoring Iraqi troop movements in the area last week, though it remains unclear how much advance information Iraq provided to American military officials.
Warren said U.S. and coalition aircraft are not providing airstrikes in support of the operation since Iraq did not request air support. A U.S. official told ABC News that the Iraqi Air Force and Army aviation are providing Iraqi troops with air cover for the operation.
Warren said the U.S. military mission in Iraq is to advise and assist Iraq's military in their fight against ISIS, but Iraq that decides the level of cooperation it wants.
A Shiite militia leader told the BBC that Iran's General Qasem Soleiman, the head of the Iranian Revolutionary Guard's Quds Force, was involved in the planning of the offensive. Officers of Iran’s Revolutionary Guards have been assisting the Iraqi military since last year and Iranian jets have conducted airstrikes against ISIS targets in eastern Iraq. Senior U.S. military officials have said repeatedly that there is no coordination with Iran in the fight against ISIS inside Iraq. "