- The Aid package is not immediately spent all at once. It authorizes up to $26 billion, but the CBO estimates it may take all the way into 2033 to claim the money.
- To that end, a lot of these costs are double counted. It's including the bill that authorizes these expenses, and then those expenses all in the same calculation.
More realistically, the $6.5M/day in theater operations for a Carrier Strike Group is probably pretty accurate (In reality, they already cost the US about $30M/day just operate normally). The flyaway costs for the Tomahawk missiles are going to be about $1M each (a lot of price estimates include the R&D costs divided per units).
In reality, the cost of a 60 day war with Iran using current methods at our current loss rates will get you closer to about $8-12B total cost. Which is still a lot more more incrementally accurate.