Each weapon in the MOH Airborne demo has three potential awards with specific upgrades. I don't know the points system required to get each step but here's what I found so far.

The awards:
1. Marksman Commendation
2. Sharpshooter Commendation
3. Expert Commendation



Thompson (M1928 Thompson)

1. Marksman Commendation Award
-Front Pistol Grip
-Improved Accuracy

2. Sharpshooter Commendation Award
-Cutts Compensator
-Reduced Recoil

3. Expert Commendation Award
-50 Round Drum Mag
-Ammo Capacity


Garand (M1 Garand)

1. Marksman Commendation Award
-Match Grade Barrel
-Improved Accuracy

2. Sharpshooter Commendation Award
-Lock Bar Adjustable Sights
-Increased Zoom

3. Expert Commendation Award
-M7A1 Grenade Launcher
-Launch Grenades


MP40 (Maschinenpistole 40)

1. Marksman Commendation Award
-Dual Magazines
-Faster Reload

2. Sharpshooter Commendation Award
-64 Round Magazine
-Ammo Capacity

3. Expert Commendation Award
-Dagger
-Melee Attack


K98k (K98k Karabiner Kurtz)

1. Marksman Commendation Award
-Polished Match Grade Bolt
-Rate of Fire

2. Sharpshooter Commendation Award
-5 Round Stripper Clip
-Faster Reload

3. Expert Commendation Award
-Grenade Launcher
-Launch Grenades


Colt .45 (M1911 Colt .45)

1. Marksman Commendation Award
-Leather Holster
-Fast Draw

2. Sharpshooter Commendation Award
-Match Grade Trigger
-Rate of Fire

3. Expert Commendation Award
-Magnum Rounds
-Increased Damage