@HorrorHound GREAT EXAMPLE.
Take Commander Adama ( Edward James Olmos) and Admiral Cain (Michelle Forbes). Both were the military figureheads of two different Battlestars, the Galactica and Pegasus, respectively. To Adama, Galactica was a family, a family that sometimes needed a father, a disciplinarian, and a friend, but ultimately their responsibility was to place their lives before the fleet and protect the last of humanity at all costs...even if that meant running and hiding. Cain's Pegasus was a warship in a time of war, and the Cylons were the enemy, and she turned a blind eye to the rape and beating of a Cylon captive as a means to fuel the fire to take the fight to the enemy. The needs of the fleet were to provide soldiers, and the mission was to fight or die. Cain wasn't above executing soldiers for refusing to follow her orders, because in wartime, cowardice/treason could be legally punished with death, and she was in charge. She wasn't evil, and she was matronly, but she was an iron fist.
BOTH existed in a genre that was gritty and fatalistic. The theme's whimsical moments were vastly outweighed by themes of survival, mourning, heartbreak, and sacrifice.
My favorite BSG character I ever encountered on any of the given mushes was a disabled engineer in a wheelchair. Like Vriess from Alien: Resurrection, she was rendered without the use of her legs and was bitter as hell about it, but she could still function. What else was she going to do? A disabled naval officer not working would just be sitting alone in some room, praying the ship didn't blow up.
It's just a setting where happy characters, unaffected by the war and are pacifists simply don't make sense. In war, even a wrench turning technician could be called to fire an assault rifle, and characters don't get to choose what they do and don't do. THAT is the spice of the genre. No one wants to fight or die, for the most part, but swearing an oath and suffering the whims of commanders who may or may not be making the right call with your life makes for a kind of obligated terror roleplay.
It was really hard roleplaying with characters who just simply didn't get why that slight film of depression and fear covered everything.