Can you redo the weapon challenges?

[Splitz-]

Just got the game so I don't know if this is a dumb question but...

I have been getting all the bonuses on the weapon challenges in the first area. Until of cours one of the sword onse to kill 50 orcs and the bonus was to get a hit streak of 100. I ended it at x91! I was miffed and wanted to redo it but the mission was gone from the spot.

[haloWARpower5]

I believe you can't redo it. Once you complete a mission (no matter if its challenges or story mission) it is gone for good unless you restart the entire game. But the bonus objective don't offer anything, just additional exp. There isn't even any record to show if you complete the bonus objective so it don't provide any "bragging right", so I suggest don't worry too much about it.