… Based on continuing support and association of state actors with the Salafi-jihadism (SJ) threat, a long-term confrontation with Iran could become a key part of American foreign and military policy. The U.S. military footprint around Iran (including in Iraq and Afghanistan) would expand.
…. In the “Sustained Sunni-Shia Conflict” trajectory, the United States might take an aggressive stance by seeking to overthrow the Iranian regime and replacing it with a moderate one that does not rely on Shiite chauvinism for its legitimacy.
(Unfolding the Future of the Long War – Motivations, Prospects, and Implications for the U.S. Army, [Prepared for the United States Army])