The following is the Nov. 17, 2022, Congressional Research Service Defense Primer: Defense Appropriations Process.
From the report
The Constitution gives Congress the power of the purse in Article I, Section 9, which provides that “No money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law.” To fulfill this duty, Congress annually considers appropriations measures, which provide funding for numerous activities—such as national defense, education, and homeland...
https://news.usni.org/2022/11/18/defense-primer-u-s-defense-appropriations-process