; (2) flight testing and evaluation; or (3) the designation or creation of new units of special use airspace, or the establishment of military flight training routes, over the wilderness areas. (f) Wildlife water development projects The Secretary may authorize structures and facilities, including existing structures and facilities, for wildlife water development projects (including guzzlers) in the wilderness areas if— (1) the structures and facilities will enhance wilderness values by promoting healthy, viable, and more naturally distributed wildlife populations; (2) the structures and facilities are consistent with the laws (including regulations) applicable to the management of the Refuge; and (3) the visual impacts of the structures and facilities on the wilderness areas can reasonably be minimized.