Talk:Mastery Rank/@comment-175.143.141.53-20130411044535/@comment-7661828-20130411140629

You might be misreading it. bonus mission might be use melee. But the mission is to use your sidearm.

The thing that kept failing me was enemies hiding behind the pillars. Enemy Rader helps. be sure to search around and make sure you've killed all of the Grineer each wave.