Nice first submisson!
This is a pretty cool song. Superdrummer already noted some problems down like the marching sounds and all. The only thing that i have to add is that the trumpets volume was a bit too loud in the part towards the end, where everything else in the background is hard to hear.
On the good side, your song is diverse. The intro is nice, what i liked about it the most is the little 3 high notes the guitar plays. All in all it's a good song and you seem to know what you are doing so just keep on submitting songs.
Good luck with the contest man.