Complete the following tasks to unlock the corresponding character.

Character	How to unlock
A. Galinsky	Complete Special Objective in Campaign Mission 1 under the Recruit difficulty setting during a Quick Mission in Mission mode.
B. Gordon	Complete Special Objective in Campaign Mission 6 under any difficulty setting.
D. Munz	Complete Special Objective in Campaign Mission 2 under the Veteran difficulty setting during a Quick Mission in Mission mode.
G. Osadze	Complete Special Objective in Campaign Mission 5 under the Veteran difficulty setting during a Quick Mission in Mission mode.
H. Ramirez	Complete Special Objective in Campaign Mission 2 under any difficulty setting.
J. Stone	Complete Special Objective in Campaign Mission 4 under any difficulty setting.
K. Henkel	Complete Special Objective in Campaign Mission 3 under any difficulty setting.
N. Tunny	Complete Special Objective in Campaign Mission 3 under the Elite difficulty setting during a Quick Mission in Mission mode.
S. Grey	Complete Special Objective in Campaign Mission 5 under any difficulty setting.
S. Ibrahim	Complete Special Objective in Campaign Mission 6 under the Elite difficulty setting during a Quick Mission in Mission mode.
W. Jacobs	Complete Special Objective in Campaign Mission 1 under any difficulty setting.