Do you allow requisitioning whole units to your players? Like sniper teams, sentries, sentinels, artillery (in form of barrages)? What are their rules?
I've been allowing to requisition artillery and mortar barrages. They're the same availability as ammo for them, but require Navigation Surface test to indicate the position of barrage to the artillery commander. Then he makes BS test and shoots at the target.
But I was also thinking about requisitioning of NPC's and taking them on a mission, in Mission Assigned Equipment (don't wanna invent all the availabilities for them). Especially when the task at hand is very demanding. On the battlefield they would be under squad leader's command and issuing orders would require Command test. They would receive penalties and bonuses to tests depending on whether the Command test was a success or failure.