I just finished my campain in the legendary difficulty and I didin’t received my Mark - VI, someone knows why ?
Only thing I can think of is you did it offline. 343i made it so you had to complete the campaign online to receive credit. If you go into commendations, and go player, you have campaign and War games. Under the Campaign commendations, it tells you which missions you still have to do on legendary, and again, it only counts for those commendations if you are online and connected to Xbox live. If you don’t complete those commendations, you don’t get Mark VI, even if you beat the campaign offline. Also you can do legendary Co-Op and still receive Mark VI, Hope this helps.
343 is screwing with you.