Eight helicopters on loan from the Illinois National Guard were expected to arrive Tuesday night in Vermont to help the Vermont National Guard deliver food, medicine, water and other supplies to 13 Vermont towns cut off from the rest of the state in the aftermath of Tropical Storm Irene.

The outside helicopter support is needed because all six of the Vermont Guard’s Black Hawk helicopters are still in Iraq, where they and 55 Vermont soldiers are wrapping up a yearlong hospital transport mission, said Lt. Lloyd Goodrow, spokesman for the Vermont Guard.

The eight helicopters being sent in include six massive, double-bladed Chinook choppers and two smaller Black Hawk helicopters, said Vermont Guard Capt. Doran Metzger.