Ranks are a feature in Duty Calls: The Calm Before the Storm. They are obtained by killing a certain number of Bad Guys. No, it doesn't give you new weapons or items to use, it just shows how awesome of a "shooter person" you are.
Rank 1: Master Sergeant Shooter Person!
Rank 2: Master Sergeant Shooter Sergeant Person!
Rank 3: Sergeant Sergeant Master Sergeant Shooter Person!
Rank 4: Master Sergeant Shooter Sergeant Important Person of Sergeants Extreme!
Rank 5: Sergeant of the Master Sergeants Most Important Person of Extreme Sergeants to the Max!