Nice start for a song, Barry. Like others, I'm finding it a little uncentred as yet.

Who are the girls in the suits?

Is our hero happy to be buggered all day? He sounds kind of jaunty about it.

D'you know what I think it needs to make it really fizz? A story:

Guantanamo Bay, hey, I'm on my way.
I won't be coming back from there, not in manys a day.
Guantanamo Bay, Am I here to stay?

Chorus: Where the sun shines hard on the dogs in the yard
             An I'm here to say there's no place in the world like Guantanamo Bay.

'Twas in the spring of 2012 I left old Peshawar,
On the way to visit my grandma, me knowing naught of war
I took a lift with some likely lads to Herat to make my way
And the next I knew I was sad and blue, in the cells of the CIA…

(Well, you see where I'm coming from, though the scansion, rhyme scheme, verse form and basically everything else doesn't match what you're doing!)