The main purpose of the Homegrown Defense Act of 2026 is to enhance the oversight of the Department of Defense (DoD) regarding its compliance with specific requirements related to domestic food supply chains. This legislation aims to ensure that the DoD is effectively managing and sourcing food supplies from within the United States, which is important for national security and self-sufficiency. Key provisions of the Act include the requirement for the Inspector General of the DoD to conduct audits.