On every ranks up, you get promoted to a higher rank, and you get to share a bag of Potato Chips with your teammates.

In return the teammate can choose to return the favor by sending you a "Lucky Card".

Level 1 Officer...
Level 5 Deputy*
Level 12 Detective*
Level 20 Corporal*
Level 32 Sergeant*
Level 45 Lieutenant*
Level 60 Captain*
Level 75 Major*
Level 100 Inspector*
Level 125 Lead Inspector*
Level 150 Commander*
Level 175 Deputy Chief*
Level 200 Commissioner*
Level 250 Sheriff*
Level 300 Ranger*
Level 350 Marshal*
Level 400 Senior Trooper *