as for the assets in iraq impacting the conflict in iran, of course, but then without iraq power projection becomes much more difficult.
sort of like the "island hopping" strategy in WWII which was necessary for the US forces to get close enough to Japan to deliver the knockout blow.
i assume airbases used for sorties from iraq to iran are in the middle of nowhere or otherwise easily secured perimeter bases, dont know that for fact but if not true then it boggles the mind.