; and (B) third-party billing for any medical costs incurred as a result of Federal Aviation Administration employees, their spouses, or their dependent children accessing and receiving medical treatment or services at a Department of Defense health care facility located in Guam. (b) Funds subject to appropriations Funds for payments by the Federal Aviation Administration described in subsection (a)(2) are subject to the availability of amounts specifically provided in advance for that purpose in appropriations Acts. (c) Report on Access to Facilities of the Department of Defense in Guam (1) In General Not later than 180 days after the date of the enactment of this Act, the Secretary of Transportation and the Secretary of Defense shall jointly submit a report to the Committees on Armed Services of the Senate and the House of Representatives, the Committee on Commerce of the Senate, and the Committee on Transportation and Infrastructure of the House of Representatives on eligibility for and access to Department of Defense support facilities by Federal Aviation Administration employees in the U.S. territory of Guam. (2) Scope The report required under paragraph (1) shall: (A) Evaluate the ability of Department of Defense support facilities in Guam to adequately serve current military personnel and dependent populations. (B) Determine how any substantial increases to military personnel and dependent populations in Guam would impact the ability of existing Department of Defense support facilities to provide services for military personnel and dependents stationed in Guam. (C) Provide recommendations on any improvements to existing Department of Defense facilities which may be needed to ensure those facilities in Guam can support an increased population of military personnel and dependent population in Guam. (D) Consider the impact of expanded access to Department of Defense support facilities in Guam to Federal Aviation Administration employees and their families on the ability of those facilities to provide services