1 - A warning box at the beginning advises that I am not signed in and that progress will not be saved. I am signed in to xbox live - should I be signed in to something else?
2 - I see that completion of the tutorial merits an achievement award. I have completed the tutorial but the achievement notification did not come up [tragic

3 - When I come to start the first campaign and having allocated the Patton points etc I next have to choose five units for mission 1from the five which are available. Having done so, a warning box appears indicating that I have more units which I could use. Is this so and if it is, where are they?
Sorry if I'm being dense but this is the first time I've played a game such as this on xbox.
Bern