What this actor is
The United States occupies three roles in this system at once, and they are not easily separated. It is a belligerent: the campaign that began on 28 February 2026 had struck more than ten thousand targets in Iran by 25 March, according to the Congressional Research Service. It is the security partner whose forces are hosted at Al Udeid in Qatar, at the Fifth Fleet's home in Bahrain and at the logistics hub in Kuwait — arrangements that predate the war by decades. And it is the author of the sanctions architecture and of the naval measures applied to Iranian exports. No account of Gulf security works without it, and the module carries all three roles rather than choosing one.
Confidence: Moderate As of 2026-09-13Reviewed 2026-09-04
The basing arrangements, and what Vigil records about them
United States forces are hosted in Bahrain, Qatar and Kuwait under publicly documented bilateral arrangements. Vigil records that those arrangements exist, with whom, and since when. It carries no facility detail, no unit information, no capability, no strength and no disposition, because the schema has no fields for any of them and none will be added. The arrangements are authored as relationships in P2.
An acknowledged civilian strike
A Tomahawk strike on a school in Minab on 28 February 2026 killed 168 people, mostly children. A preliminary investigation found the United States responsible and attributed the strike to outdated targeting information. This is a US-acknowledged responsibility rather than an Iranian allegation, and the module carries it as such.
Contested claims run both ways
After the exchange of 1–2 September 2026 the Islamic Revolutionary Guard Corps claimed a large number of American personnel killed in Jordan; two US officials told Reuters initial assessments showed no American casualties. Both are claims and the module publishes them as a contradiction rather than resolving it. The same rule applies to every party in this system.
Objectives
What the actor says, kept apart from what Vigil assesses. Each stated entry cites where the position was made; Vigil records that it was made, not that it is true.
Stated by the actor
The campaign opened on 28 February 2026 has been framed by United States statements around Iran's nuclear programme, its missile forces and its regional partner networks.
As of 2026-03 Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz
Freedom of navigation in the strait, pursued through the naval interdiction of Iranian exports begun in April 2026, the Combined Maritime Forces' standing mission and the International Maritime Security Construct.
As of 2026-09 Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz · Combined Maritime Forces↗ · International Maritime Security Construct
A negotiated settlement on United States terms: the June 2026 memorandum was signed and then declared over by the President on 7 July, and no successor framework has been published.
As of 2026-08 Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz · Al Jazeera English↗
Defence of partner territory without direct participation in the Saudi–Houthi front: reported offers of intelligence and targeting support to Riyadh in September while declining strikes on the Houthis.
As of 2026-09 Sources: Established international media reporting · Congressional Research Service — Iran, the Gulf and the Strait of Hormuz
Assessed by Vigil
Washington is a belligerent, a guarantor and a sanctions authority at once, and the three roles pull against each other: the campaign against Iran raises the cost of the hosting arrangements it relies on, and the sanctions architecture it authored is what makes a settlement expensive to sell at home.
Confidence: Moderate Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz
The refusal to strike the Houthis or refuel Saudi aircraft while fighting Iran indicates a deliberate boundary around the war — Iran and its direct forces in, Yemen out — that the Bab el-Mandeb advance is now testing.
Confidence: Low Sources: Established international media reporting · Congressional Research Service — Iran, the Gulf and the Strait of Hormuz
Constraints
What limits this actor's options, with the kind of limit it is.
Every forward position is on a host's territory, and every host has been struck; Qatar mediates with Tehran while hosting the campaign's headquarters, and Bahrain's and Kuwait's arrangements are older than the war they now serve.
External Confidence: High Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz · Gulf state official government sources
The Minab school strike, with 168 killed and responsibility acknowledged after a preliminary investigation, and the contested casualty claims after 1–2 September, constrain the campaign's domestic and regional standing.
Domestic political Confidence: Moderate Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz · Al Jazeera English↗ · Reuters↗
At the Security Council two permanent members vetoed the April draft on Hormuz shipping and can veto any measure that follows the IAEA referral; the legal track runs through a body Washington does not control.
Legal Confidence: High Sources: UN Security Council and Panel of Experts reporting↗
Sources of leverage
What this actor can bring to bear, and how firmly each is established.
The campaign itself, the naval interdiction of Iranian exports, the sanctions architecture including General License U, and the Fifth Fleet's command of the coalition structures in Bahrain.
Confidence: High Sources: Congressional Research Service — Iran, the Gulf and the Strait of Hormuz · Combined Maritime Forces↗
What remains unknown
- What the June memorandum contained beyond its sixty-day window; the text was not published.
- The content of the reported September support to Saudi Arabia; neither government has published an account.
Observables — The United States in the Gulf
Observables, not predictions. Each is something that would change this assessment if it moved.
Escalation
Direct United States strikes on Houthi positions or forces on the Red Sea coast
Would erase the boundary the September reporting describes.
De-escalation
A published successor to the June memorandum
No operative agreement of any kind has been in force since 17 August.
Posture as of 2026-09-13Posture reviewed 2026-09-14
Not published for The United States in the GulfRed lines
Elsewhere in Iran–Gulf
Last reviewed — 2026-09-04