Not exactly but:

Soldier Boy (http://www.fanfiction.net/s/3556794/1/Soldier_Boy) (AU. 18 yr old Sam Winchester doesn't go to Stanford like his Family thinks he did)

American Soldier (http://www.fanfiction.net/s/3251227/1/American_Soldier)(Dean signs up for the Army. A small peek inside his life on base.)

Travelin Soldier (http://www.sinful-desire.org/archive/viewstory.php?sid=2378&warning=5) (J2 AU, Jensen is going away and Jared is the small town boy watching him fade from view.)

The Walk Back Home (Through Nightmare) (http://caymai.livejournal.com/5177.html#cutid1) (War is never easy. Sergeant Ackles hates it in Vietnam)

Thanks :D
I will have a read of them soon
<333

You're welcome :)

I like 'the walk back home' that is a good one

I like "Soldier Boy"
<33

South China Sea (http://tabaqui.livejournal.com/140033.html) by tabaqui is a really wonderful J2 AU set in Vietnam.

I know it's not exactly what you're looking for, but The Long Way Home (http://www.fanfiction.net/s/3879595/1/The_Long_Way_Home) and it's sequel The Long Way Back (http://www.fanfiction.net/s/4171237/1/The_Long_Way_Back) have Marine Dean.

Ok thanks
<3