The Defense Health Agency Prevention Services Enhancement Act requires the Secretary of Defense to report to Congress within 180 days on whether the military could consolidate prevention services—such as sexual assault prevention, suicide prevention, harassment prevention, and domestic violence services—into single facilities at each military installation across the United States. The briefing must assess the feasibility and costs of this consolidation, and evaluate what efforts military departments have already made in this direction, including any successes and lessons learned. The bill essentially directs the Defense Department to study whether centralizing these prevention services would be practical and cost-effective, rather than having them scattered across multiple locations at each base. No new funding is specified in the legislation; it only requires a study and report to inform future decision-making.