CT has an optional rule for character death where the character serves two years instead of the full four for the term and musters out then.
I don't recommend the rule, for a number of reasons.
Character death in CT is actually a player tool. It's a feature--a benefit for the player.
The player rolls stats straight--just 2D for each characteristic. If a player doesn't like what he gets, his recourse is to kill the character off in character generation. There is a slight risk that the character cannot be killed, but, most times, the player can be successful in killing off the character.
This dead character isn't wasted. The Ref should take the character and add him to the NPC pool. The character, maybe altered a bit, will probably show up in the game somewhere as an adversary. Nothing is wasted. It's a nice Ref tool to have a short stack of killed off characters to just grab and use impromptu during a game.
Using Book 1 rules, stats are rolled iron man style, just 2D for each attribute, as I described above. Then, the player chooses one of the six careers and tries for enlistment. If enlistment is missed, the character must submit to the Draft. Plus, even though the player picks the table to roll upon for skills, the skills must still be rolled.
Thus, if a player is keen to play a particular character--let's say he wants to play a Scout--killing off the character that doesn't become a Scout is the game rule that allows the player to generally play what he wants.
Of course, there are limits. Maybe the character isn't killed off, which usually has a charm all its own--it's not unusual for a player to change his mind about a character who persists in living, discovering an affection for the stubborn character. But, for the most part, killing off the character is a tool the player can use to skew the randomly rolled character towards something the player wants to play.