ok so i was playing halo earlier, completed the campaign on normal, and had done some legendary upto mission 5. Anyway i had played enough and left. I just went back to get the midnight launch achievement, GMT time and when i went on all my campaign missions had gone, my armour reset, emblem reset, etc and got welcome videos. I still have all my spartan ops shown as completed on legendary and my sr rank as 28. Can anyone help, do i have to re-complete those missions on legendary solo again?