Decided to take a quick look at USAspending.gov re: hypersonic weapons to see where the money is being spent. Interesting stuff - 'hypersonic air breathing weapon(s)'??

Using 'hypersonic' as the keyword search nets $1.1B in contracts. "Hypersonic air breathing weapons" nets a bit over $471M.

Use the advanced search to see spending by year.

https://www.usaspending.gov/#/keyword_search/%22hypersonic%22

https://www.usaspending.gov/#/award/CONT_AWD_HR001117C0025_9700_-NONE-_-NONE-

https://www.usaspending.gov/#/search/71e4855624b50f8dbb4e610f280e1e0c