When was the catastrophic EF5-rated multiple-vortex tornado struck after which the Missouri Militia members have been active in disaster relief?
Missouri Militia: The Missouri Militia is a private, non-profit civilian defense organization in the U.S. state of Missouri. Missouri Militia:  Its members have been active in disaster relief after the 2011 Joplin tornado. 2011 Joplin tornado: The 2011 Joplin tornado was a catastrophic EF5-rated multiple-vortex tornado that struck Joplin, Missouri, late in the afternoon of Sunday, May 22, 2011.
May 22, 2011