I know that Colonel Green was Union commander of Glasgow the following spring of 1865, probably of the Volunteer Missouri Militis (VMM or MM).
The MM was the creation of MG Granville Dodge--who was a man of few words, thoughtful, very practical, and rather businesslike about how he managed the mess that was Missouri during December 1864 through 1865. I would guess that the MM were nearly all radicals, armed to the teeth, and not shy about shooting guerrillas (and a few others, it seems). These men were determined to extinguish anything that was between them and a return to peace and properity, to coin a phrase. There were two separate iterations of the MM--one in January 1865 and the second in April 1865, which I can barely tell apart. Dodge ordered all the other stay-at-home militias to disband by the end of March, but kept the active duty Missouri State Militia (MSM) until their three-year term expired, which took place starting about March 1865, just before the guerrilas who wintered away returned.
It is my opinion that S.O. 126 was the moderates' dying gasp to try to effect the conduct of the war that the radicals (including all those Union troops) were already conducting their own way. I think ejecting all the more radical officers was a political move to remove all those leaders from positions of respect and authority to attempt to affect the next election. I would like to prove that, but, well.... Some of the General Assembly's investigation looked at cruel officers and atrocities, but mostly looked at southern sympathizers in the various kinds of militias, which the investigators seemed to feel were hampering the conduct of the war in Missouri.
Thanks for the thoughtful reply.
Bruce