Will US forces enter Iran? The ground entry term structure is overpriced.

Executive summary

| | | |---|---| | Primary position | BUY NO at 31.5% — Mar 31 contract | | Secondary position | BUY NO at 20.0% — Mar 14 contract | | Tertiary position | BUY NO at 58.5% — Dec 31 contract | | No trade | Mar 7 contract (edge too narrow) | | Total series volume | $3.04M / Mar 31 primary at $1.53M | | Conviction | 4/10 near-term, 5/10 Dec 31 |

-- The market

Polymarket lists four binary contracts asking whether active US military personnel will physically enter the terrestrial territory of Iran under Operation Epic Fury. Resolution requires uniformed US military personnel on Iranian soil. Special Operations Forces qualify. Intelligence operatives, contractors, advisors, and maritime or aerial presence do not.

The contracts resolve on March 7, March 14, March 31, and December 31, 2026 — a term structure on ground entry risk.

Operation Epic Fury launched in late February 2026, targeting nuclear infrastructure, military command facilities, and ballistic missile stockpiles. The Trump administration projects four to five weeks of air operations. Secretary Hegseth has cited three to eight weeks. The administration has explicitly stated that ground troops are not part of the plan. Iran has retaliated with over 500 ballistic missiles and 2,000 drones, killing six US military personnel. On March 4, the Senate failed to pass a war powers constraint by a 47-53 vote.

-- The consensus

The market prices a steep near-term escalation curve.

| Contract | Market price | Implied odds | |:---|:---|:---| | Mar 7, 2026 | 6.1% | 1-in-16 by end of first week | | Mar 14, 2026 | 20.0% | 1-in-5 by mid-month | | Mar 31, 2026 | 31.5% | 1-in-3 by month-end | | Dec 31, 2026 | 58.5% | More likely than not by year-end |

The crowd thesis rests on three inputs: Trump's repeated refusal to rule out boots on the ground, the scale of the conflict interpreted as inevitable escalation, and the Senate's failure to impose a war powers constraint.

-- The alpha

The term structure is overpriced across all four contracts. Five ground-entry pathways are modeled for each resolution date: a SOF raid on Iranian nuclear facilities, a SOF ground damage assessment mission, Kurdish proxy operations with US military advisors, a personnel rescue triggered by an aircraft shootdown, and escalation from a mass-casualty Iranian counter-attack. The first two share a common trigger and are treated as a correlated block.

Aggregating across all five, fair values land at approximately 1.5%, 5%, 10%, and 22% against market prices of 6.1%, 20.0%, 31.5%, and 58.5%.

| Contract | Market | Fair value | Edge | Position | Conviction | |:---|:---|:---|:---|:---|:---| | Mar 7 | 6.1% | 1.5% | +4.6pp | NO TRADE | 4/10 | | Mar 14 | 20.0% | 5% | +15pp | BUY NO | 4/10 | | Mar 31 | 31.5% | 10% | +21.5pp | BUY NO | 4/10 | | Dec 31 | 58.5% | 22% | +36.5pp | BUY NO | 5/10 |

Four structural factors explain the mispricing.

Operational sequence. The US military exhausts its air campaign before committing ground forces. Afghanistan is the fastest historical comparable at 26 days from air start to first SOF insertion, against a far simpler adversary with cooperative proxies already in place and congressional authorization. Iran is an 88 million-person state with sophisticated air defenses and no equivalent proxy structure.

The GBU-57. The Massive Ordnance Penetrator was built specifically to defeat deeply buried nuclear facilities without ground insertion. Its existence reflects a deliberate decision to avoid ground operations at hardened sites. If the weapon proves insufficient, the next step is to redesign the mission, not to automatically insert SOF.

Administration posture. The explicit no-ground-troops position is a meaningful probability anchor, not rhetorical noise. It constrains political authorization and creates a domestic political cost for reversal.

Historical base rate. The post-2003 trend is zero full ground invasions across seven US military theaters. The December 31 contract at 58.5% appears to price the raw historical base rate without adjusting for this shift.

The overpricing is most acute in the near term and fades as the resolution date extends further out — a familiar pattern during active conflicts, where traders overpay for short-dated contracts on high-salience events.

| Window | Incremental FV | Incremental market | Overpricing ratio | Notes | |:---|:---|:---|:---|:---| | Mar 7 → Mar 14 | 3.5pp | 13.9pp | 3.97x | Steep lottery premium | | Mar 14 → Mar 31 | 5.0pp | 11.5pp | 2.30x | Moderate structural gap | | Mar 31 → Dec 31 | 12.0pp | 27.0pp | 2.25x | Base rate anchoring |

-- Risk factors

Fordow survives the bombing. Fordow is buried under approximately 80 meters of rock. If post-strike intelligence reveals it survived intact and Iran continues enriching uranium there, pressure for a ground operation to physically destroy or seize the site intensifies significantly.

Mass-casualty retaliation. Iran has already fired over 500 ballistic missiles and 2,000 drones at US regional bases. A second, more devastating salvo causing dozens of American fatalities would shift the political calculus toward escalation faster than any planned operational timeline.

Downed aircraft. Every day of air operations carries a small cumulative risk of losing an aircraft with a surviving crew member inside Iranian territory. A captured or stranded US pilot would almost certainly trigger an immediate rescue mission, which would itself constitute ground entry under the resolution criteria.

Classified operations. No publicly available intelligence can rule out US special operations forces already pre-positioned near Iran's borders. If a classified ground operation is already underway or imminent, market prices may reflect that before any public announcement. This is not hypothetical — Polymarket contracts on Venezuelan political outcomes moved ahead of a covert US operation in January 2026 before any public announcement.

-- Bottom line

BUY NO across the board. The market is pricing a conflict poised to escalate into ground operations. The structural evidence points in the other direction.

The primary position is BUY NO at 31.5% on the March 31 contract. It is the most actively traded in the series at $1.53M volume, carries a 21.5pp gap between fair value and market price, and the thesis holds up under aggressive stress testing. Fair value is approximately 10%. The air campaign has not stalled, the administration has not shifted its stated posture, and no triggering event for a ground operation has yet materialized.

The secondary position is BUY NO at 20.0% on the March 14 contract. It offers a 15pp edge over a nine-day resolution window — the best short-duration trade in the set.

The March 7 contract is a NO TRADE. The edge exists but is too narrow to justify entry given the confidence level and the short window.

The December 31 contract is BUY NO at 58.5% with the highest analytical confidence in the series. The 36.5pp gap between fair value and market price is the largest in the set. Size it conservatively relative to the near-term positions. Ten months of active conflict introduces scenarios no analysis can fully anticipate, and a large edge on a long-dated contract is worth less in practice than the same edge resolving in nine days.