Prohibits the obligation or expenditure of Department of Defense (DOD) funds to retire, prepare to retire, or place in storage any KC-10 aircraft until: (1) the Secretary of the Air Force certifies that the four KC-46A test aircraft are all built and fully operational, the initial 18 KC-46A aircraft have been delivered to the Air Force in a fully operational capacity by 2017, the KC-46A aircraft has achieved full operational capability, and a sufficient number of KC-46A aircraft exists in the Air Force's inventory to fully meet the air refueling and cargo support capability and mission requirements of the combatant commands; and (2) the Comptroller General (GAO) submits a report setting forth an assessment of whether each such certification is comprehensive, fully supported, and sufficiently detailed and an identification of any shortcomings, limitations, or other reportable matters that affect the quality or findings of any such certification.