It's a bit old-fashioned. It would be better to say "The soldier is so brave" (if you mean one specific soldier) or "soldiers are so brave"(if you mean soldiers in general) Alternatives would be: Soldiers are very brave Soldiers are heroes It takes courage to be a soldier Nobody is braver than a soldier

Thank you Lee.

How brave he is! What a brave soldier he is ! These are the same meaning, and either is fine to me.

Thank you Phil.

Those are both options, but with different meanings.