Early reports suggest National Security Advisor John Bolton presented a plan that called for 120,000 U.S. troops to counter Iran, just in case the Islamic Republic ups the ante by attacking American forces or starts building nuclear weapons again.
Tensions in the region are reaching a fever pitch as the United States sends more warships, including the USS Abraham Lincoln into the Persian Gulf and the Saudis accuse Iran of attacking oil tankers using armed drones. According to the New York Times, Bolton’s plan does not include a ground invasion force. But John Bolton is no moderate when it comes to regime change, and there’s no way his plan for the United States toppling the Iranian regime precludes a ground invasion.

The guy who openly admits he joined the National Guard because he didn’t want to die in a rice paddy in Vietnam has no problem sending your kids to die in Iran.
Bolton has openly advocated for the U.S. to use military power to foment regime change everywhere from Syria and Iran to North Korea and Venezuela. Bolton even backed the U.S. invasion of Iraq and still maintains it was a good idea, despite everyone else, from historians to President Bush himself, admitting it was a costly, bungled pipe dream. President Bush soon learned from his mistakes and Bolton’s career was wisely kicked back into the loony bin where it belongs.
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But there’s a new President in office, one who has elevated Bolton and his hawkish sentiment to the post of National Security Advisor. While Bolton may have presented a plan without an invasion force, it’s very likely he has one somewhere that does include an invasion, and 120,000 troops will not be enough.

John Bolton is a mouth just begging for a sock.
The extra seapower is likely just the beginning of the overall plan to topple the Islamic Republic. A complete naval blockade in the Persian Gulf would be necessary to cut Iran off from outside supplies, help from the Revolutionary Guards Corps forces, and protect international shipping lanes. This sounds like it should be easy for the U.S. Navy, but Iran’s unconventional naval forces could prove difficult to subdue without American losses.
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That would be a significant escalation, perhaps even enough to subdue the Iranian regime for the time being. But that’s not John Bolton’s style, as cyber attacks would work to cripple what military, economic, and physical infrastructure it could while U.S. troops deploy inside Iran. The Islamic Republic is firmly situation between Iraq and a hard place, both countries where American troops are deployed and have freedom to move.

The worldwide demand for white Toyota pickups is about to skyrocket. Or land rocket. Because of Javelins.
Then the ground game will begin. Tier one forces from the U.S. Special Operations command will conduct leadership strikes and capture or destroy command and control elements. Other special operators will have to engage Iranian special forces inside Iran and wherever else they’re deployed near U.S. troops, especially in Iraq and Syria. It’s likely that Army Special Forces would link up with anti-regime fighters inside Iran to foment an internal uprising against the regime.
Meanwhile, the main ground invasion force will have to contend with some 500,000 defenders, made up of Iran’s actual army, unconventional Quds Force troops, Shia militias like those seen in the Iraq War and the fight against ISIS, and potentially more unconventional forces and tactics.
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Conventional American troops will seal the country off along its borders, especially the porous ones next to Iraq and Afghanistan, where significant numbers of American combat troops are already deployed. The combined squeeze of American troops from the East and West along with the naval blockade of the Persian Gulf would be akin to Winfield Scott’s Civil War-era Anaconda Plan, which crippled Confederate supply lines while strangling the South. American forces would move from the northern areas to southern Iran in a multi-pronged movement.
The first prong would be a thrust from the northwest into the southern oil fields and into the Strait of Hormuz, securing Iranian oil and shipping infrastructure. The second prong would move right into northern Iran, cutting it off from its northern neighbors. The final thrust would likely cut Tehran off from the outside while keeping an eye on the border with Pakistan.

Kinda like this except in the desert… and the Indians are very different.
While Iran’s borders with Iraq and Afghanistan make moving U.S. troops to the Iranian combat zone easier, it also leaves America’s supply lines vulnerable to attack. These would need to be reinforced and protected at every opportunity and are vulnerable to sympathetic forces that could be exploited by Iran’s Revolutionary Guards or Quds Forces, as all routes into Afghanistan pass through Iranian neighbors or their allies, which include Pakistan.
How long this would take is anyone’s guess, but the United States managed to build up its forces and topple Saddam Hussein’s Iranian regime in less than a year, though CIA operatives had been in-country with opposition forces for longer. If the CIA or American special operations troops are already inside Iran, then the invasion has already begun.