I've updated the scripts for mission 1,3,15 and 20 (the ones with protecting your section leader as your main objective), fixing the two bugs (failure message appearing for each friendly airplane downed after the section leader was shot down, and section leader shoot down failing the mission even if it wasn't shot down by another airplane).

PS: just a suggestion regarding the update posts, I think it would be better to just move the update post's content to the first page, so it would be perfectly visible for anyone looking for the campaign.