Hundreds of police officers at one of the country's busiest airports say that in the case of an active shooter, they are instructed to run and hide. Their badges, uniforms and vehicles all say police. And they are certified police officers in the state of Illinois. But these nearly 300 aviation police officers, also known as aviation security officers, are not allowed to carry guns at Chicago's O'Hare and Midway airports. Via CNN. Posted By Persist