Here is a direct link to the recruit mini-games
http://recruit.flashpointgame.com/
Unlocking the missions requires you simply to load up the game and in the main menu select the "bonus codes" option. Once in there all you need to do is enter the code and voila, the mission is unlocked and will appear in the mission selection screen.
Here are details of the two Fire Team Engagement missions that you can unlock with the codes:
Encampment
Controlling a Spec Ops team, this FTE tasks players with ambushing a PLA campsite in the dead of night.
Set in a heavily forested area, players must move cautiously between tree cover, with the PLA fanning out and trying to flank at every opportunity. A fierce and atmospheric firefight, mixing long-range marksmen shooting and close quarters combat around the campsites.
Debris Field
Set amongst the vehicle wrecks from an earlier battle players must lead their fireteam through the strewn vehicle wreckage, seeking cover wherever they can, and engage superior numbers of PLA forces assaulting their position.
The player must work with their fireteam to ensure that the large numbers of PLA don’t flank them at any time, stay mobile and use fully automatic weapons, grenades and grenade launchers to suppress the enemy at every opportunity.
