Yes, he is asking that, Mr. Polite.
Now to answer his question:
It is never stated who Rick and Shane's backup is in issue 1 or any other issue. It isn't even stated if they had a backup at all but they presumably did. The only other officer that Rick worked with that was mentioned throughout the comic series was in issue 1, and his name was Gilroy. He mentioned him to the horse.
In the TV Series, we know of the following officers:
Rick Grimes
Shane Walsh
Leon Basset
Lambert Kendall
Diane (only mentioned in episode 1)
Linda (only mentioned in episode 1)
Don (only appeared in the Dead Reckoning game)
Hope that helped :-)