Before I respond to your silly statements would you tell me how old you are? If I am speaking to a child, I will make an allowance for that but just to a limited extent. If my first response to you sounded silly then you now know how your post sounded to me. It's called sarcasm. Trust me when I tell you that I did not go "beserker" on you. I could but we'd both be banned I'm sure. You made ludicrous statements about the organization I worked for for 22 years. Nobody I know ever joined the Army without knowing that it's purpose is to defend the country. By the time you're old enough to enlist (18), it is assumed that you know what an army does.
WARNING SACARCASM ALERT:
It would be like joining the Navy and being surprised that they have ships or joining the Air Force and finding out that those bombs are meant to kill people. SARCASM OFF
Fighting is what the Army and the rest of the military does and everybody knows that. What a potential recruit might want to know is "what's in it for me?" and that's what the commercials show. Each branch of the service presents its benefits and selling points. Things like pride and love of country and the desire to serve your fellow countrymen, the desire to follow in the footsteps of the brave people that went before you.