I had an idea for soldat: insert a new kind of match...the story mode.
It may be composed of a long map, and the soldier will go in the map killing the bad bots against him. Isn't it a cool idea?

This has been suggested before and turned down before, please use the Search next time before posting here. :)
There is a special kind of inf-maps that are like a single/coop-mode, get them in the maps section.

EDIT:
Searched a little for you:

Single Player map - ctf_Berlin
Single Player

There are most likely more but I was too lazy.