Let's kick it up a notch.
The galaxy is a dangerous place.
Sophi, Alpha and Nargle, Commissars in the Imperial Navy, are painfully aware of this fact. Their job was a thankless one - the commissars were the ones who made sure the men were loyal, and they were the first ones to take the fall when a politician needed to cover his misdoings. Such was their fate now.
Consul MDK of the Imperial Assembly, a powerful political man, had ordered their battalions to participate in the conquest of some small, backwater planet. They didn't know why - the Consul probably thought he was advancing his political agenda somehow. It didn't matter; they didn't question orders.
The planet was settled by a handful of potato farmers - Sophi, Alpha and Nargle led their units in the slaughter of these oafs, as they were ordered to do, though it left a sick taste in their mouth.
A few standard weeks later, news of the massacre reached the media. One would expect this to end MDK's career, but it didn't - he had found a way to put the blame on the killers' commanders. Our Commissars. That was how the three of our outfit found themselves in the brig of a prison ship headed for the Core worlds. They were to be executed publicly, without doubt.
The three had begun to accept their inevitable fate, when a freak solar storm knocked their transport's main systems offline. They took this as their chance to escape. In the panic of the power-outage, Sophi, Nargle and Alpha managed to make it to the escape pods and jettisons themselves onto the small planet below.
That's where we begin.
_____Sophi: Part of a soldier-breeding program, the brainchild of MDK, to which he owes his position. Grown to be physically superior to normal humans. The genetic tampering tends to lead to mental unstability, however, and these vatgrown soldiers tend to dislike socialization. She is unusually pious for this day-and-age. Also she can't carry a tune to save her life.
_____Nargle: Another genetic supersoldier, Nargle is a horribly disfigured character, with a gnarled face. Nargle is also hemophobic, an interesting trait for a soldier.
_____Alpha: A lowborn orphan, Alpha worked his way up the chain of command through blood, sweat and tears. He fancies himself an artist, and enjoys the finer, carnal pleasures in life..
Our refugees land on this unknown world, and set to work to building a sustainable safehouse. No doubt MDK will send men to try to kill them. They set up a small perimeter and farm, and begin to dig a bunker into the mountainside. The long, grandiose entrance hallway takes a week to dig out, but will act as a shooting gallery should thugs show up.
A few cycles pass without any incident. A squirrel goes mad and tries to kill the survivors, but being trained soldier, it posed no threat.
Then, suddenly a group of five raiders shows up, armed with Uzis, shotguns, grenades, molotov cocktails, and flamethrowers. Yikes.
Hopefully our heroes can hold them off.
As soon as they see the drop pods landing, the three ex-military officers build a few more turrets. They're in for a wild fight.