referring to the payment as”voluntary”有点像民事诉讼,赔钱但不认错.legally

Payment Agreements
U.S. $4.5 million “Voluntary Humanitarian Payment”. On July 30, 1999, the
United States agreed to make a “voluntary humanitarian payment”of $4.5 million to the
families of the 3 killed and to the 27 injured as a result of the NATO bombing error. U.S.
officials were particular in referring to the payment as “voluntary” in order to avoid
acknowledging legal liability.