NCOs (Non-Commissioned Officers) do not have the ORDER ability, that is something only Commissioned Officers have. See the optional beta "Company Commander" free rules supplement available for download in the rules page: 1-48tactic.com/rules.htm
Commissioned Officers are all named Characters so can choose if they want to move with the rest or not.
All characters (friend or foe and living or dead alike), do not block Los but do count as Protecting terrain. (For the records, is on pag. 34 in the Core rulebook)
My source is exactly this beta rules, which I printed and use. Speaking about Nco, I’m referring to named Corporal Spitale and likely Sergeant John Kelly. Besides I don have any else officers, for the moment. And then again, on pg 1, I read, below Command Radius, about cpl and sgt, and made the connection!
officers will be in the card decks, and at some point we will also make figures for them, but there is no need for officers unless you play with a lot of figures, you can not even use them if you don't field at least a full squad, that is 10-12 other Characters... just getting there with the first two factions!