US Military Commanders Warn Defense Secretary of Iran Campaign Strain

Senior U.S. military commanders have warned Defense Secretary Mark Esper that the prolonged, large-scale campaign against Iran is unsustainable and is degrading the military's ability to address other global threats, including defending the United States itself. The warnings, detailed in a classified assessment for Esper, were conveyed by the heads of the Army, Navy, Air Force, and commanders responsible for Europe, Asia, and Latin America. These concerns were included in the "Secretary of Defense's Planning Guidance" for August 14, a document outlining the availability of U.S. forces worldwide.

The alert comes after six months of operations against Iran, during which President Donald Trump has pressured Tehran to reopen the Strait of Hormuz and accept U.S. terms. Trump has kept all options on the table, including renewed strikes, leading U.S. Central Command to maintain over 50,000 troops on alert. Some forces deployed in the Middle East have had their tours extended to September, with others potentially remaining until 2027. Air Force units involved in round-the-clock operations are also expected to stay in the region until 2027, prompting explicit opposition from some senior leaders.

Commanders from European, Pacific, and Southern Commands, along with the Navy chief, formally expressed "non-concurrence" with the extended force allocation, meaning they oppose the decision but will execute it if it remains in effect. The primary reason cited is the diversion of forces, ships, and aircraft originally intended for Europe, Asia, and Latin America to the Iran campaign, which has hampered these commands' ability to perform their missions and maintain operational readiness. One source described the overall message from military leadership as "too much, for too long," noting the commanders presented a "darker" picture than usual, with some generals and admirals being particularly direct in their opposition.

The Navy faces a particularly severe situation. Admiral Daryl Caudle, head of Naval Operations, warned that the fleet cannot sustain the current level of support for the Iran campaign indefinitely, especially without a clear end date. The Navy has been required to provide dozens of vessels for operations, including enforcing Trump's blockade on Iranian ports. This has led to extended deployments for some ships and crews. Caudle cautioned that less than a quarter of the U.S. destroyer fleet is currently operational, a significant drop. He warned that continued demands could jeopardize fleet readiness for other potential conflicts.

Commanders of European and Southern Commands also warned that transferring intelligence and surveillance aircraft to Central Command has impacted their ability to defend the U.S. homeland. Admiral Samuel Paparo, head of Pacific Command, opposed the level of support required, including an aircraft carrier strike group. The strain is particularly felt in Asia, with the USS George Washington aircraft carrier redeployed to the Middle East, replacing the USS Abraham Lincoln, which has been deployed for over 300 days. Allies in the region have expressed concern that the depletion of U.S. missile and interceptor stocks could weaken deterrence against China and North Korea. The U.S. recently canceled an amphibious landing exercise with South Korea due to the strain on American forces.

While Army and Air Force commanders did not formally oppose the extensions, they also warned of risks. Approximately 2,000 soldiers from the 82nd Airborne Division, deployed in March, are expected to remain in the Middle East until at least September, potentially longer, as they are considered a key force for a potential ground operation in Iran. Units operating Patriot air defense systems are also extending their deployments. The war has depleted interceptor stocks for Patriot and THAAD systems, as well as Tomahawk cruise missiles. The Pentagon has reportedly lost about 25% of its Reaper drones during the conflict, with billions of dollars in damage to U.S. bases in the region. The Trump administration disputes reports of ammunition shortages, though Trump himself reportedly confronted Esper about the issue, expressing frustration that it remained unresolved.

The Pentagon has urged defense contractors to dramatically accelerate weapons production, but industry sources warn that replenishing some stocks could take years. The strain on U.S. inventories is immense, with U.S. forces reportedly attacking over 13,000 targets in Iran and facing over 8,500 missile and drone threats between late February and early April alone. Earlier, the Chairman of the Joint Chiefs of Staff, General Mark Milley, had warned the White House about insufficient U.S. ammunition and allied support for a prolonged, large-scale conflict. Pentagon spokesperson Sean Reardon stated that force allocation decisions are based on threat assessments and presidential priorities, and that the Pentagon does not publicly discuss internal operational processes or risk assessments.