Which military act must be adhered to when conscripting individuals for service?

The Military Selective Service Act is the correct answer because it specifically provides the legal framework for conscription in the United States. This act mandates that eligible citizens register for selective service, which allows the government to draft individuals into military service during times of national emergency or war. The act outlines the registration process, the rights of individuals, and the guidelines for who may be drafted, ensuring that the process is fair and consistent.

In contrast, the Military Assistance Act primarily deals with the provision of military support and assistance to foreign countries, the National Defense Act outlines broad aspects of military organization and funding, and the Veterans Affairs Act focuses on the benefits and services provided to veterans after their service rather than the enlistment or conscription process itself. Thus, the Military Selective Service Act is uniquely relevant to the conscription of individuals for service.