Create the following classes:

Class 1
Primary weapon: Your choice.
Secondary weapon: None.
Equipment: Tactical Insertion.
Special grenade: Your choice.
Perk 1: One Man Army.
Perk 2: Hardline Pro.
Perk 3: Your choice.
Death Streak: Final Stand.

Class 2
Perk 3: Last Stand

Note: Also make this class built to quickly kill your enemy.
After you make those classes, to host a private match or a split-screen match. Make sure that your friend is willing to be killed multiple times. If no one is willing, then use an empty player (a controlled player with no one actually controlling it). Start with Class 1. Allow your friend to kill you until Final Stand is activated. Have your friend shoot you into Final Stand. Once you are in Final Stand, activate One Man Army and switch to your second class. After you get up, start killing your friend. Every kill you get will count as a Last Stand kill. Every kill will also count toward One Man Army.