Inclusion of contract clause in contracts awarded before effective date— At the time of any major modification to a contract that was awarded before the date of the enactment of this Act, the head of the contracting agency shall make best efforts to include in the contract a contract clause providing for the applicability of the amendments made by this section and section 827 of the National Defense Authorization Act for Fiscal Year 2013 (
Public Law 112–239; 126 Stat. 1833).