The purpose of this management advisory is to inform the Deputy Assistant Secretary of Defense for Housing of the lack of DoD policy addressing potentially elevated levels of radon in off-base housing outside the continental United States and to notify Navy officials of the need to better communicate potentially elevated radon levels to personnel living in Naples off-base housing. During the “Audit of the DoD’s Management of Air Quality Issues at Camp Lemonnier, Djibouti,” (Project No D2023 D000RJ-0155.000), we received a complaint regarding NSA Naples management of potentially elevated radon levels within off-base housing. As a result of the complaint, we initiated specific steps to determine whether Naval Support Activity Naples tested, mitigated, and communicated elevated radon levels in accordance with DoD and Navy regulations.