; and (B) by inserting (including units of the National Guard and Reserves) after identification of the units . (b) Information required To keep database current Such section is further amended by adding at the end the following new subsection: (b) Information required To keep database current In implementing and maintaining the database required by subsection (a), the Secretary shall identify and revise the information required to be included in the database at least once every two years for purposes of keeping the database current. . XV Authorization of Additional Appropriations for Overseas Contingency Operations A Authorization of Appropriations 1501. Purpose The purpose of this subtitle is to authorize appropriations for the Department of Defense for fiscal year 2018 to provide additional funds for overseas contingency operations being carried out by the Armed Forces. 1502. Overseas contingency operations Funds are hereby authorized to be appropriated for fiscal year 2018 for the Department of Defense for overseas contingency operations in such amounts as may be designated as provided in section 251(b)(2)(A)(ii) of the Balanced Budget and Emergency Deficit Control Act of 1985. 1503. Procurement Funds are hereby authorized to be appropriated for fiscal year 2018 for procurement accounts for the Army, the Navy and the Marine Corps, the Air Force, and Defense-wide activities, as specified in the funding table in section 4102. 1504. Research, development, test, and evaluation Funds are hereby authorized to be appropriated for fiscal year 2018 for the use of the Department of Defense for research, development, test, and evaluation, as specified in the funding table in section 4202. 1505. Operation and maintenance Funds are hereby authorized to be appropriated for fiscal year 2018 for the use of the Armed Forces and other activities and agencies of the Department of Defense for expenses, not otherwise provided for, for operation and maintenance, as specified in the funding table in section 4302. 1506. Military