Reach the following ranks to unlock the corresponding prestige medals:

RANK - MEDAL
Level 1 - Gold shield with silver eagle.
Level 2 - Blue titanic diamond with star spikes.
Level 3 - Emerald in the middle with four lines with circles on the ends.
Level 4 - Black circle in the middle with white, gold, maroon, and tan edges.
Level 5 - Gold badge with one eye in the middle.
Level 6 - Gold eagle in the middle with six lines.
Level 7 - Thin cross with wings on the outside and a square gold lined sheet in the middle.
Level 8 - Red diamond in middle with a triangle shield on the outside with gold and white trim.
Level 9 - Maroon and black Star Of David.
Level 10 - Gold iron cross.