Unknown heroes of a war

Random poem from my mind, tell me how to improve please

An American soldier upon his back
The man looks left and right, for any sight of an enemies attack
Unknown heroes of the war
You watch my back, I watch yours
The heroes who do it because it needs to be done
Not for the spotlight or the anything in the long run
Just does what is needed
His deeds are all unheeded
Maybe he gets a medal for risking his life
Even though he fights in someone else’s strife
The deeds of the battlefield forgotten when he comes home
No respect towards him is shown
Unknown heroes of the war
Hoping just to make it back to their door
Unknown heroes without them, where would we be?