The war in Iraq cost a trillion dollars.
More like $2 T (combined Iraq-Afganistan $4.3T) https://www.warcosts.org/compare/iraq-vs-afghanistan-cost
So far.
That's referring to the Iraq and Afghanistan war with appropriations from 2003 to 2010. https://en.wikipedia.org/wiki/Financial_cost_of_the_Iraq_War
The Iran war that we're currently in is officially at 43B and estimated at 48B. https://iran-cost-ticker.com
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1 week national battery storage is totally doable. All we need to do is convince the rest of the planet to stop making GPUs, phones, computers, and EVs for the next decade, and then give us all their rocks.
78.4TWh is about $19T (all in costs) for a national battery grid for 1 week storage, could be built over ten years but would need the US to build and own double the current global output, not even considering where all the raw materials and labor comes from.