The immediate backdrop is the active March 2026 US–Israel campaign against Iran that began with coordinated strikes on Iranian power plants, air defenses and military infrastructure; Iranian military actions throughout 2026 have been explicit responses to that campaign rather than unprovoked attacks.
That campaign followed months of escalating U.S. and allied force postures in the CENTCOM theater, including deployments of additional air and naval assets and air-defense batteries, as governments sought to deter further damage to regional infrastructure.
A newly released Lead Inspector General report to Congress documents large-scale U.S. military activity and evacuations during the opening months of the war with Iran. The report says the U.S. deployed more than 50,000 U.S.
Service Members across the US CENTCOM area of responsibility in support of Operation Epic Fury and that the United States helped evacuate 9,000 U.S. citizens during April–June 2026 (per jpost.com).
The report also records that Iran carried out 600 attacks in Iraq, mounted either directly from Iran or through proxy forces, and that U.S. force flows and dispositions shifted as major combat operations began (per jpost.com).
The Inspector General lists the scale of platforms sent to the theater: more than a dozen fighter squadrons, roughly the same number of Navy destroyers, and multiple air defense batteries, including deployed THAAD systems, which the report notes were added to the region (per jpost.com).
CENTCOM told the inspector general that force presence and disposition changed throughout the conflict and that reinforcements continued moving into the region after major combat operations began (per jpost.com). The report frames these moves as part of Operation Epic Fury, the U.S. operational name for its campaign in the theater (per jpost.com).
The evacuation figure — 9,000 U.S. citizens — underscores the campaign’s immediate impacts on Americans in the region and the scale of U.S. noncombatant evacuation operations (per jpost.com).
The report pairs that human-mobility figure with the operational picture: 600 reported Iranian attacks in Iraq during the same period, suggesting how the U.S. judged threats to bases, logistics and civilians in the theater (per jpost.com).
The inspector general’s account is descriptive rather than analytic; it catalogs deployments, movements and counts of attacks and evacuees without attributing strategic intent beyond naming Operation Epic Fury (per jpost.com).
Taken together, the figures in the inspector general report provide Congress with an operational overview: a large U.S. force posture, active missile defenses, continued force flows into CENTCOM and a major evacuation effort amid hundreds of attacks traced to Iran or its proxies.
Lawmakers and policymakers will use those numbers to assess force adequacy, rules of engagement, and civilian-protection measures as the campaign continues (per jpost.com).