Community member Ashfire908 comes out swinging with a hardcore challenge in the clouds - Legendary with the Iron skull! Thank the lucky stars he didn't choose Tilt or Mythic - a slow steady and methodical approach should get you through this challenge. And once you do, you'll receive a sweet achievement for your troubles.
Don't like campaign? Check out Zoo Zoom. No restrictions, no worries, tons of fun. Grab some buddies and head out into Lost Platoon for an entire Set of carnage. No restrictions for this challenge! And you'll earn an achievement for properly completing this mission!
Fire Team Zulu: Zoo Zoom / Ashes to Fire