This item has been deleted from the data source, but is kept here for reference.
Defeat a Vex boss, or defeat a Guardian with a Rocket Launcher in the Crucible.
"The Vex are becoming a problem across the system again. Take out an Axis-Mind level construct to help us lower those numbers. Or if you feel like helping Shaxx run some drills, he could use a Rocket Launcher unit in the Crucible." —Ana Bray