Predicting the total cost of the campaign is difficult, and experts warn the greater challenge may be inventory.

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The long-running confrontation between the US and Iran entered a new phase on Saturday when joint US-Israeli air strikes targeted Iran, marking a moment of open military hostilities.

As US President Donald Trump signals that operations could last four to five weeks, we look at whether Washington can sustain a new war in the Middle East, and what it might ultimately cost.