Pentagon names four of six U.S. service members killed in Iran war's first five days

Six U.S. service members were killed in the first five days of Operation Epic Fury, the U.S.-Israeli war against Iran. The Pentagon released the names of four of them on March 4, 2026. Two names were withheld pending next-of-kin notification.

SOSgt. O'Brien and CMCpl. Marzan were among the confirmed dead, both killed March 1 at Port Shuaiba, Kuwait — a coalition logistics and resupply hub — when Iranian forces struck with drones. Their deaths were the first confirmed combat fatalities of the operation.

The drone attacks that killed U.S. personnel targeted Gulf positions — Kuwait, logistics hubs, and support facilities — rather than the main combat theater inside Iran. Iran's strategy of striking at logistics and support assets in neighboring countries was consistent with its doctrine of 'defense in depth' designed to raise the cost of extended operations.

Defense Secretary PHPete Hegseth extended the projected war timeline from the initial estimate to eight weeks on March 4. The extension came five days into the conflict, suggesting the original planning timeline had underestimated Iranian resistance or the complexity of achieving the operation's stated objectives.

Hegseth announced that a U.S. Navy submarine had sunk an Iranian warship in the Strait of Hormuz — the first enemy warship sunk in combat by U.S. forces since World War II. The sinking marked a significant escalation in the naval dimension of the conflict and further disrupted Hormuz transit.

Hegseth simultaneously acknowledged that U.S. munitions stockpiles were 'not where we want to be,' confirming what classified assessments cited by NBC News had found: the U.S. had potentially fired up to 50% of its THAAD interceptor inventory in the operation's first days, and high-grade precision munitions were depleting faster than expected.

Sen. Andy Kim (D-NJ), a veteran and senator whose state has a large military community, said Trump 'chose to put these Americans in harm's way' without congressional authorization. His statement directly linked each death to the absence of a congressional war vote.

Every service member who died in Operation Epic Fury's first five days died in an unauthorized war. The Senate voted 47-53 on March 4 not to require Trump to seek congressional authorization. The juxtaposition — a war powers vote on the same day as the naming of the dead — framed the constitutional question in human terms.

The war's first five days also saw six U.S. service members killed, one enemy warship sunk, three U.S. tech data centers destroyed, the Strait of Hormuz near-closed to commercial traffic, and a 10%+ spike in global oil prices. These are the measurable costs of the first five days of an unauthorized war.

Historically, U.S. presidents have faced the most significant political pressure to seek congressional authorization after initial combat casualties mount. The Kennedy, Johnson, and Nixon administrations all faced intensifying congressional pushback as Vietnam casualties rose. Whether the same dynamic will develop in the Iran war is the central political question going forward.