American military leaders sought to ease growing concerns on Monday about a drawn-out conflict in the Middle East, yet refused to provide a timeline for when operations targeting Iran would end and conceded that further US casualties were expected. The remarks came after the United States and Israel launched their most extensive combined strikes against Iran in decades over the weekend, killing Supreme Leader Ayatollah Ali Khamenei, sinking Iranian naval vessels, and hitting more than 1 000 targets thus far.
Defence Secretary Pete Hegseth framed the campaign's objectives in purely military terms, stating the Pentagon sought to neutralise Iran's navy and its vast missile stockpile — capabilities he said could shield any covert nuclear weapons programme Tehran might pursue. Iran has consistently denied harbouring ambitions to acquire nuclear arms. "To the media outlets and political left screaming 'ENDLESS WARS' - stop. This is not Iraq. This is not endless," Hegseth declared. A former Fox News presenter and Army veteran who served in Iraq from 2005 to 2006 and deployed to Afghanistan in 2012, Hegseth insisted ground forces were not presently involved but would not rule out their future use.
The joint offensive has drawn significant Iranian retaliation, though US and allied forces have intercepted many of the most dangerous incoming drones and missiles. Some strikes nonetheless reached American positions. The US military confirmed a fourth service member died from injuries sustained during the campaign on Monday, while six others were hurt after Kuwaiti air defence systems accidentally brought down three American F-15 fighter jets. "We expect to take additional losses," Caine told media at a briefing, describing the situation as "major combat operations" while pledging efforts to minimise casualties.
Democratic politicians have condemned President Trump for putting American lives at risk in what they regard as a war of choice, questioning his justification for abandoning diplomatic talks that mediator Oman had characterised as still holding promise. Trump has asserted, without furnishing evidence, that Iran was on the verge of developing the ability to strike US soil with a ballistic missile. However, during private briefings with congressional staff on Sunday, administration officials admitted no intelligence indicated Iran had been planning a first strike against American forces, according to two people familiar with those discussions — a concession that appeared to contradict earlier claims by senior figures that the president acted partly on indications Tehran might pre-emptively attack US assets in the region.
As the aerial campaign widened on Monday, Caine confirmed that American troop numbers in the Middle East continued to climb, building on what was already the largest deployment since the 2003 invasion of Iraq. Despite the relentless bombardment, Iran's conservative clerical establishment has shown no signs of surrendering power, with military analysts cautioning that air power alone, absent ground forces, may not be enough to dislodge them.
"We are not going into the exercise of (saying) what we will or will not do," Hegseth stated. "President Trump ensures that our enemies understand we'll go as far as we need to go to advance American interests. But we're not dumb about it. You don't have to roll 200 000 people in there and stay 20 years."
