They asked, but not for help.

Via The Geek with a .45:

Their Finest Hour

In the future many observations will be made of this battle: that the Al Qaeda timed their assaults to coincide with US unit rotations through Iraq; that they chose the moment when the baton is passing from US soldier to Iraqi policeman. But if the Iraqi nation goes on to live another hundred years, it will remember this:

Officers from the 82nd Airborne Division stationed a 10-minute drive away could hear the battle clearly. They offered help but the Hammad said it wasn't needed. The Americans did provide additional ammunition and weapons, including light machine guns. After the battle, soldiers at the civil defense base proudly displayed a light machine gun and a pair of rocket propelled grenade launchers they had captured from the attackers.

That when dying and bleeding, beset by the flower of terrorism, with pistol to set against automatic rifle and grenade, the Iraqi police did not ask for help from 82nd Airborne. They asked for ammunition.

They didn't ask for help, they asked for the means to help themselves. The 82nd Airborne could have gone over there anyway and taken charge, but they didn't. They let the Iraqi's fight, and win, their own battle.