Board Thread:Warhammer 40k General Discussion/@comment-7499389-20130411032000/@comment-1583177-20130612211255

3 Parts Imperial Guard, 2 Parts Necron, 1 Part Tau and 1 part Space Marine.

So from this I deduce:

I am an ex imperial guard serviceman who grew up on a world run by the Tau empire and became a space marine who used Necron Parts as augments to replace my damaged limbs (judging by the fact I'm 2 parts necron, I suffered a lot of limb injuries).