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 the video seemed a kind of dress rehearsal, showing them walking the halls of the school, and shooting bullies outside with fake guns. On October 21, 2003, a video was released showing the pair doing target practice on March 6, 1999, in nearby foothills known as Rampart Range, with the weapons they would use in the massacre. Also shooting with them is Mark Manes and Phil Duran, older men who helped supply one of the guns, and Manes's girlfriend. Harris and Klebold also kept five video tapes shot with school video equipment that documented their weapons, as well as their