Columbine High School massacre Potential Students") program. He found the transition to Ken Caryl Middle School difficult. Unlike the white caps of the jocks, Harris and Klebold wore black baseball caps. As was typical in the 1990s, they wore them backwards. Harris wore a KMFDM cap, and apparently did not wear it during the massacre. Klebold's cap had a Colorado Avalanche logo on the front and a Boston Red Sox logo sewn onto the back. Following the Columbine shooting, schools across the United States instituted new security measures such as see-through backpacks, metal detectors, school uniforms, and security guards. Some schools implemented school door
Columbine High School massacre film's acronym, NBK, as a code for the massacre. In February 1998, Klebold envisioned a massacre with a girl like in the film, writing "Soon...either ill commit suicide, or I'll get w. [redacted girl's name] & it will be NBK for us." In April 1998, Harris wrote "When I go NBK and people say things like "oh it was tragic" or "oh he is crazy!" or "It was so bloody." I think, so the fuck what you think that's a bad thing?" In Harris's yearbook Klebold wrote "the holy April morning of NBK". Around February 1999, he wrote "maybe going