Effective 28 Aug 2006
9.134. United States flag and state flag to be flown at half-staff on September 11. — The United States flag and the Missouri state flag shall be flown at half-staff on all government buildings on each September eleventh in honor of the individuals who died as a result of the terrorist attacks against the United States on September 11, 2001.
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(L. 2006 H.B. 983)