The main purpose of this legislation is to create a specific criminal penalty for individuals who unlawfully enter Department of Defense (DoD) facilities. The goal is to enhance security and protect sensitive areas from unauthorized access, which could pose risks to national security. Key provisions of the law establish that it is illegal to enter any property managed by the Department of Defense that is clearly marked as closed or restricted without proper authorization. The law outlines a tiered penalty system based on the number of offenses.