I think that support troops, like the 507th Maintenance, would have benefited from being armed with the old AK-47. Reports indicated that all of their M-16's jammed at the critical moment. Support troops obviously aren't as diligent at cleaning their weapons so they probably should be equipped with a more forgiving weapon.
Ain't that the truth (I'm a former support troop). I imagine there are a few infantry soldiers who would prefer an AK variant in cruddy conditions too. Sometimes you don't have time to do a thorough cleaning.