If the strike against iran happened The USA will participate in logistics, satalite , electronic jamming, and maybe send in a few dozens of their specialy build planes equiped with special bombs. who is going to know if the USA participated in the attack. fueling in mnid air can take you long ways.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Iran military head warns of 'heavy damage' should Israel attack