If you have seen the new assignments when the new maps came out, I'm sure you have seen the Phantom Prospect assignment, which is under the Gold assignments. If you notice the requirements though, it has a question mark and play as premium once. To open the requirements you need to do the following. Please note this only works if you are a premium member. On the Battlelog page you need to click on the Leaderboards tab. Next you scroll down to the bottom and at the bottom left corner you will see a silver skull. Click on the skull and a bunch of text will appear. When that is finished you need to enter a passcode which is bumpinthenight. Hit enter and then the assignment will be unlocked. Close battlelog and re-open to see the requirements for the assignment and the reward which is the Phantom Program dog tag.

Awesome!! Thanks, just unlocked it, thanks for the tip.

that is great thank u for all the help

it worked for me