Unlock Commander:
Obtain STAFF SERGEANT Rank.

Unlock German General
Obtain SERGEANT Rank.

Unlock German Gunner
Obtain 1st CLASS SERGEANT Rank.

Unlock Kriegsmarine
Obtain SPECIALIST Rank.

Unlock Navy Crewman
Obtain CORPORAL Rank.

Unlock Navy Gunner
Kill 50 enemies in Campaign Mode.

Unlock Secret Police
Kill 150 enemies in Campaign Mode.

Unlock Sergeant
Complete Campaign Mode in VETERAN difficulty.

Unlock Special Forces
Kill 100 enemies in Campaign Mode.

Unlock US Pilot
Kill 75 enemies in Campaign Mode.

Unlock Winter Infantry
Kill 200 enemies in Campaign Mode.