all funds subject to such guarantee to the units of general local government in non-entitlement areas that received the commitment. 215. Public housing agencies that own and operate 400 or fewer public housing units may elect to be exempt from any asset management requirement imposed by the Secretary of Housing and Urban Development in connection with the operating fund rule: Provided , That an agency seeking a discontinuance of a reduction of subsidy under the operating fund formula shall not be exempt from asset management requirements. 216. With respect to the use of amounts provided in this Act and in future Acts for the operation, capital improvement and management of public housing as authorized by sections 9(d) and 9(e) of the United States Housing Act of 1937 ( 42 U.S.C. 1437g(d) and (e)), the Secretary shall not impose any requirement or guideline relating to asset management that restricts or limits in any way the use of capital funds for central office costs pursuant to section 9(g)(1) or 9(g)(2) of the United States Housing Act of 1937 ( 42 U.S.C. 1437g(g)(1) , (2)): Provided , That a public housing agency may not use capital funds authorized under section 9(d) for activities that are eligible under section 9(e) for assistance with amounts from the operating fund in excess of the amounts permitted under section 9(g)(1) or 9(g)(2). 217. No official or employee of the Department of Housing and Urban Development shall be designated as an allotment holder unless the Office of the Chief Financial Officer has determined that such allotment holder has implemented an adequate system of funds control and has received training in funds control procedures and directives. The Chief Financial Officer shall ensure that there is a trained allotment holder for each HUD appropriation under the accounts Executive Offices and Administrative Support Offices, as well as each account receiving appropriations under the general heading Program Office Salaries and Expenses , Government National Mortgage