 As a result of the 1995 sarin gas attack on a Tokyo subway and the growing concern about a terrorist chemical attack, the U.S. Congress passed laws to implement a program to train civilian, law enforcement, and fire agencies on responding to incidents involving chemical agents.Further, United States Army Reserve chemical units began fielding equipment and training Soldiers to perform mass casualty decontamination operations.A 1996 United States General Accounting Office report concluded that U.S. troops remained highly vulnerable to attack from both chemical and biological agents.