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OAHU, HI - FEBRUARY 18: Kindergarten students lie on the floor during a classroom lockdown drill February 18, 2003 in Oahu, Hawaii. Lockdown procedure is used to protect school children from possible threats on campus such as intruders, terrorism or military attack. (Photo by Phil Mislinski/Getty Images)

These copyright - protected images may not be used for commercial or editorial purposes without written permission from Phil Mislinski.