U.S. Constitution, Article I — The Legislative Branch, Section 8, Clause 12
To raise and support Armies, but no Appropriation of Money to that Use shall be for a longer Term than two Years;
Notes
Allows Congress to raise and support armies, but limits any appropriation of money for that use to a term of no longer than two years. Congress can fund an army, yet must renew that funding at least every two years rather than committing money for longer.
Use as reference
Lexinter.net | U.S. Const. art. I, § 8, cl. 12 | https://laws.lexinter.net/constitution/us/article-1/section-8/clause-12