The first American flag-draped coffin to arrive home will land with greater force than any Iranian missile.
For President Donald Trump, the loss of US military personnel redraws the political battlefield at home.
Trump has long cast himself as a president who understands the cost of war in human terms.
He mocked "forever wars" and vowed that American blood would no longer be spilt in distant deserts.
But the campaign rhetoric met harsh reality when he found himself back in the White House.
The moment American casualties were confirmed on Sunday, the war with Iran ceased to be something abstract.
Three personnel were killed and five others seriously wounded in a strike on a US base in Kuwait.
In Washington, the deaths - and his warning that there could be more - further polarised politics.
Supporters rallied around Trump, arguing that backing down now would dishonour the fallen.
Critics, meanwhile, framed the casualties as evidence of a president's recklessness.
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The political middle - often quiet but decisive - asked the critical question: What are we dying for?
Escalation risks turning him into the kind of Middle East war president his own base rejected.
His U-turn, however justified on strategic grounds, will be tested in this year's mid-term elections.
History suggests that presidents do not lose support simply because Americans die on the battlefield.
They lose it when deaths feel pointless, endless or poorly explained by the commander-in-chief.
In his latest address to the nation, he prepared Americans for a longer war and more casualties.
The speed with which it appears to be spreading across the Middle East will be another concern.
The longer it goes on, the more lives lost and the wider it spreads, the harder diplomacy becomes.
In the end, American lives lost in war with Iran will confront Trump with the paradox of leadership.
Power is never more absolute than in war, but never more fragile either.
Missiles might shape the conflict overseas, but it is mourning and memory that dictate its political cost.
(c) Sky News 2026: American deaths will dictate political cost of Donald Trump's strikes on Iran
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