One should remember that despite their unshakable loyalty to Guy nither Isha nor Arturia will follow any order without question and in fact, both have been known to be rather violent towards Guy.
One particular event was taken after a particular campaign.
Guy had sensed the presence of an unknown artifact and like usual he was about to go retrieve it, however by doing so he would have risked putting the entire regiment they had ben attached to.
Arturia did not give him the chance to do so, and as punishment for his insistence in retrieving the artifact, she took away his rations and what little water supply Guy had with him.
Her command was simple yet effective, if Guy wanted water then he would have to get his water thru a filter that was latter discover to be malfunctioning.
As for food, Arturia was quoted saying that he could eat when the guard as a whole finally rested again.
The guard never had a chance to rest after that, as the war only intensified after that and for nine days, Guy was forced to scavenge whatever ration the dead guardsmen around him carried.
It should be noted that Guy did not easily forgive Arturia for this either, somehow he had been separated from his team during those nine days and it was only because he retreated and retrieved the artifact that he even survived.
What he uncovered were a series of Round and Heater shields, normally something so mundane would have never made a difference, however, that is had these been normal shields.
Made of some sort of an unknown metal, any kinetic and energy attacks that struck the shields were absorbed and rendered ineffective.
When word of the artifacts reached the guard, the men and women quickly took up the shields and charged forward.
Now known as the shield guard, the defenders received attack after attack and never slowed down, behind them the light of lassgun fire as the rest of the guard returned fire to the enemies.
When the fighting finally ended and the team was ordered to return to the Penal Colony, it was said that silence completely took over the victorious defenders, as Guy was quoted saying to Arturia that he no longer believed that they could be Master and Servant any longer.
"I think its best if I give you your freedom." Were his words.
Something like this would normally not be anything worth noticing, yet wherever the Unit went victory was sure to follow, thus when Guy uttered those words nearly all Guardsmen present, including captains and generals could not believe their ears.
So greate was this event that many guardsmen threatened to shoot Guy at the spot, however, their comrades restrained them, as Guy was as much part of Unit as Arturia.
Normally when transported to any planet, Arturia, Isha, and Guy, would travel together, this did not occur in the return trip and even the other prisoners that would normally attack Guy were seen staying away from him.
It's said that in the entire time Guy held the flag Unit had made for themselves in his hands.
The Flag, the flag that Unit carried was carried by Guy, it was originally nothing more than a small object that could be placed on a person and carried everywhere the person went.
The image of a sword placed by Arturia in the center of the flag, the image of tree branches on the left and right side of the flag, a small circle by the Sargent and a book placed by Guy on the top part of the Flag.
With every war fought the small object that was carried on the box set that Guy used for communication, changed to a full-blown flag, it would be the honor of the guardsman found most respected by Guy to carry the flag.
It's said that whenever the flag went, injuries heald faster and even the effects of chaotic corruption was either slow down or completely stopped.
It's even noted that guardsmen would hold their breaths in hopes of being chosen to carry the flag into battle.
So when word got out that Guy would strip his emblem from the flag, more than one individual wanted to either kill Guy or brainwash him into obedience.
Altering a flag in any way was already something that wasn't taken lightly, as guardsmen and Astartes are known to die before a flag fall to the ground,
So if Guy were to remove his emblem, his name would be removed from Unit and even if he ever were to fully return to the team, his name would not be recorded as a member of the Unit.
Even more important was the belief that if Guy were to alter the design of the flag, the blessings granted by the flag could be corrupted or completely stopped.