Mo. Rev. Stat. § 253.048
Within the state parks, the department may accompany the display of the flag of the United States and the flag of this state with the display of the MIA/POW flag, which is designed to commemorate the service and sacrifice of members of the Armed Forces of the United States who were prisoners of war or missing in action and with the display of the Honor and Remember flag as an official recognition and in honor of fallen members of the Armed Forces of the United States.
(L. 1994 H.B. 1545, A.L. 2013 S.B. 106 merged with S.B. 117)