Notwithstanding the amounts specified in chapter 87 of title 5, a Foreign Service employee who dies as a result of injuries sustained while on duty abroad because of an act of terrorism, as defined in section 2656f(d) of this title, shall be eligible for a special payment of $400,000, which shall be in addition to any employer provided life insurance policy coverage. In the case of an employee compensated under a local compensation plan established under section 3968 of this title, the amount of such payment shall be determined by regulations implemented by the Secretary of State and shall be no greater than $400,000. The group life insurance supplement employee benefit paid or scheduled to be paid pursuant to this section should not be used to reduce any other payment to which a recipient is otherwise eligible under Federal law.