When she was of age , Seegrist attempted to enlist in the U.S. Army . As she was being inducted , she faced harassment from other members of her platoon , who assumed she was a lesbian ; they set her up on a prank date and made her the butt of many jokes thereafter . Seegrist spent a good deal of time at the Springfield Mall , harassing customers and making statements about how " good " other spree killings were , such as the 1984 San Ysidro McDonald 's massacre . She was discharged from the Army after two months because of her unusual behavior , which included sitting fully dressed in green fatigues at the spa and sauna of her fitness club . An instructor at the fitness club said " she hated everyone and would often talk about shooting and killing people "
San Ysidro McDonald 's massacre
San Ysidro McDonald's massacre
Sylvia Seegrist