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Yes it is pretty small and you might have to be quick as when I go to click it a banner at the bottom of the screen appears telling me about the Xbox 360 BF4 with links to my loadouts and servers...
Once you click the image a screen will load up with blue writing which will eventually ask for a password which I think it is "bumpinthenight" and you will need to be premium I think to get the assignment.
This is the dog tag you will unlock.
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A mate told me about this and I just started it last night. Its requirements are:
200 Assault Rifle kills
200 Main Battle Tank kills
Score a 300m headshot (I think this is broken as it adds up from all your games as in my first game I got 51m from using Assault Rifles and then got a 200ish headshot with my M98B and it was accomplished).
Its one of the few Assignments I can do except for the MP7 assignment is kind of broken for me as the SRAW isn't a portable AA... I might need to use a Stinger or Igla to destroy a Helicopter though =/