[Milsurplus] what is 407th MM Ord Company" ?

[Hubert Miller]

This is something my father ( deceased ) wrote in 2006:
" After serving with advancing troops in WWII through North Africa, Sicily, Italy, Corsica, and 
Southern France where my unit the 410th Anti-Aircraft 90MM Gun Battalion was de-activated.
Re-activated as the 407th MM Ord Company of the 101st Airborne Division, my unit supported the
63rd Infantry Division moving through Alsace France and into Germany. 
In the early days of May probably 5-6 May 1945 my company "rumbled" into the small village of
Hardheim Germany (south of Wurzburg Germany) and halted as the war came to an end."

I have a question maybe you can help with: what does this mean, "MM Ord Company" ? 

I thought he was assigned to a maintenance van for optical equipment, but I may be wrong. 
Somewhere we have a photo of him standing on a KO'd Italian tank, but for some reason after 
North Africa, no more pictures. 
In class or out of school, the old saying:  "I should have asked more questions."
thanks-
Hue Miller