The Arapahoe State High School shooting happened just one day before Tac*One consulting had a "lone wolf [shooter]" drill planned for Arapahoe Community College.
Now ask yourself, was something else going on here or was it just an impossible coincidence.

Here is the reasoning behind all these drills going live,
http://www.concealednation.org/2013/12/colorado-shooting-over-in-80-seconds-because-of-armed-staff-member/
The time to be vigilant is now, God Bless