Quality

[Dog Soldier]

If they have been reduced through fatigue, low ammo, low fuel etc to morale "F", then they will function as morale F and not receive the +20% combat modifier etc.
If they can be removed from the line and take time to rest and reorganize, they can regain their "A" status in time.

As I said above in this thread, one must balance the need to maintain as high a morale level as possible while keeping the defense strong ot the attack going. Troops who fight 24/7 will be worn to mutiny!

Dog Soldier