Which act governs recruitment and service of non-commissioned officers?

The Military Selective Service Act is the correct choice because it establishes the legal framework governing the recruitment and service of non-commissioned officers and other military personnel in the United States. This act is essential in outlining the processes for conscription (the draft) and ensuring that qualified individuals are made available to serve in the armed forces, particularly during times of need.

This legislation also stipulates the obligations of U.S. citizens concerning registration for the draft and provides guidelines for how the selection process is carried out. While other acts mentioned may address different aspects of military service or structure, the Military Selective Service Act specifically pertains to the recruitment mechanisms and the responsibilities of those who may be called to serve as non-commissioned officers.