Lost at War

This is my first ever poem so any replies / criticism is greatly appreciated. 

Straight out of training, into a different world,
Into the war zones they are hurled,
Shipped off to risk their lives as teenagers
Sent to go and get rid of the terrorist invaders,

Up before dawn, back after dusk,
Not once did they make a fuss,
Not knowing if it'll be their last day,
Don't worry about me mother, they always say,

Although they worry themselves all the time,
They tell their loved ones everything will be fine,
Don't worry mum, don't worry dad,
Please, just for me, don't be sad

Away from families for up to a year,
Not once ever showing their fear,
Having to be the brave ones out in a different land,
Fighting non stop in the scorching heat and sand

The tours nearly over, they forget about normality,
They're used to every day brutality,
They come home and it doesn't feel right,
They hear the smallest bang and are filled with freight

They can't speak to anyone, nobody would understand,
Nobody gets what happens out in that foreign land,
The things they saw at that age just wasn't fair,
They may be home now, but part of them is still there.