Pharaoh,
Ah, ok. Right now the Blackhawk is the primary utility helo used by the US Army. There ARE still Hueys used, although the Army is hoping to retire all of them by 2006.
OH/AH/MH-6s are used by special ops guys in the 160th SOAR, but not really by regular Army units any more. The current scout helo is the OH-58D, which has a secondary attack role. The US light divisions, (10th Mountain, 25th Infantry, and 82nd Airborne) use the -58 in the attack role and have no Apaches in their TO&E.
Regular infantry divisions and Armored divisions each have a single Apache battalion, along with two battalions of lift helicopters (UH-60s). Each also has a single CH-47 unit as well.
The 101st Air Assault Division is the only division-sized unit with three Apache battalions and three Blackhawk battalions. XVIII Airborne Corps also has three Apache battalions, but those battalions can be employed as support for any of the Corps' lesser units. I've got several buddies in the 1/229th of the XVIII Airborne corps, and in Afghanistan they flew in support of both the 82nd Airborne and SF teams.
Most, but not all active Army Apache units are operating the AH-64D now. The primary conversion point is Ft. Hood, where units bring in their A model Apaches and do their D model workups. The Guard and Reserves will be flying A models for a few years yet. If all goes well I'll be flying AH-64As with the TX Guard in two years.
Hope that helps, If I can be of any more help, feel free to email me!