I used to play competitive Halo back in the day. Traveled for tourneys and such. Never was one of the elite though. (This was for Halo2). When I first started playing I needed a name, so SpecOps=special operations/operative, and death just gives it a nice ring to finish the name. For some reason it's stuck since then.
As for the picture, it's one of a halo character named "Griff". He's my favorite in the Red vs Blue series so I stuck with the original Halo theme and put him in.
If you haven't seen red vs blue it's a great freaking series. Extremely funny. Free online and all too