In about 10% of extremist incidents involving former or current military members between 1990 and 2021, the suspects were connected or inspired by overseas jihadist groups, including ISIS. In about 10% of extremist incidents involving former or current military members between 1990 and 2021, the suspects were connected or inspired by overseas jihadist groups, including ISIS. In about 10% of extremist incidents involving former or current military members between 1990 and 2021, the suspects were connected or inspired by overseas jihadist groups, including ISIS.