Description
Info from wookiepedia with heavy editing from me.
RC-1207, a.k.a. Delta-07, or Sev, was born in the year 32 BBY in the cloning facilities of Tipoca City on the aquatic planet of Kamino. A clone of the Mandalorian bounty hunter Jango Fett and created to serve in the Grand Army of the Republic as a clone commando, RC-1207 took the name "Sev" for himself, the name originating from the last digit of his numerical designation, and was placed under the training of the Mandalorian Cuy'val Dar training sergeant, Walon Vau. Vau believed in training his clones hard, giving them his worst in training so that they could perform to their best once out in the field—to do anything less would compromise them. Though there were those who believed that Vau's methods were too brutal, Sev was grateful to Vau for making him and his clone brethren into survivors. Sev looked up to Vau, and had a desperate desire not to ever let his training sergeant down. As a result, Sev would push himself to the point of daily exhaustion, often collapsing into his bunk at the end of each day of training. Sev was assigned to Delta Squad, one of the first commando units established by the Kaminoans, along with, RC-1140, and RC-1262, and under the command of sergeant RC-1138—nicknamed "Fixer", "Scorch", and "Boss", respectively. As his training progressed, Sev stood out in ambush training and quickly displayed his skill as a sniper; the Kaminoan project coordinator for the Republic's clone army, Taun We, regarded Sev as a fierce hunter. He fought in the clone wars alongside his brothers in Delta Squad on a number of battlefields, ranging from the deserts of Geonosis, the halls of the RAS Prosecutor, and the streets of Coruscant, to snowy Mygeeto and the the plains of Haurgab. Known for his morbid sense of humor and a hatred of Geonosians, Sev was an efficient killer and loyal soldier.
The rest is horrifically long, so suffice it to say, they went on a lot of missions and were awesomely successful.
Sev is a genetically modified clone of Jango Fett, and ages at twice the normal rate. He also has perfect recall.
I'm skipping the rest. It hasn't happened yet, because I am currently the god of this character. :) None of the squad is dead yet. They have gone on a few of the missions with the Nulls, and then Delta Squad was sent to investigate disturbance field in a galaxy far, far way... And you know the rest.