In 2022, the defense dept spent 590billion dollars, 2% of that would be 11.8 billion dollars. While it is impossible to calculate the cost of constructing this sphere, it cost 25 billion dollars to develop the Airbus A380, and 150 Billion to complete the International space station.

The US defense budget isn't an infinite pool of money. It's 15% of the federal budget. It's dwarfed by healthcare spending (27%), and Social Security (24%). I'm not a war hawk, I try to bring this up in lefty spaces because skimming off the defense budget to solve social problems is a common, and silly belief.

https://en.wikipedia.org/wiki/United_States_federal_budget#Major_expenditure_categories