What amendment was conscription of armed forces?

Conscription of armed forces in the United States is primarily associated with the Selective Service Act rather than a specific constitutional amendment. The authority for conscription is derived from Congress's power to raise and support armies under Article I, Section 8 of the Constitution. The 13th Amendment, which abolished slavery, has also been interpreted to support the legality of conscription by establishing that involuntary service can be required in times of war.