But be careful, they may want to draft you after you win! 
Play & Win with U.S. Army Sniper School
Published January 7, 2007
The U.S. Army Sniper School is sponsoring a special Play & Win contest featuring Halo® 3. The entry period for the sweepstakes is six full days, and you can get a new entry for each day you play a Halo 3multiplayer
match online. We've got more than a thousand prizes to give away, and
the Grand Prize is a limited-edition, framed piece of Halo 3 artwork. Don't miss your chance to win!
You could win this limited-edition Halo print.
"Dismount"
is a Limited Edition Giclee Print on Paper by Acme Archives Limited.
This piece is limited to 150 pieces and includes a title tag (this is a
sample image, the Grand Prize may be framed and matted differently).
Just register your gamertag
before midnight ET on January 25, and then play in an online
multiplayer match between 12:01 A.M. Eastern Time (ET) on January 19,
2008, and 11:59 P.M. ET on January 25, 2008 to enter. You'll score a
new sweepstakes entry for every day you play during the entry period.
One (1) Grand Prize:
- Limited Edition, framed piece of Halo 3 Artwork with commemorative Sniper School plaque and certificate of authenticity
One thousand two hundred fifty (1,250) Daily Prize Winners:
You must register for your chance to win!
Register your gamertag before the end of the promotion on January 25. Check out the Play & Win rules
for full details on the sweepstakes, including more info on how to
register and participate, as well as detailed prize information.
The
Play & Win promotions from Xbox.com are an easy way to jump in and
interact with the Xbox LIVE community. It's easy to enter and you could
win some great prizes. Look for more exciting Play & Win promotions
in the future!
NO PURCHASE NECESSARY.
Open only to legal residents of the 50 United States (includes the
District of Columbia) 18+. Game ends January 25, 2008. For details
including free, alternate method of entry, see the Official Rules.
Thanks Xbox.com