7 0 3Actions Report Solution The mission "A Recruit's Duty" has 5 sub objectives that are very easy to S rank, making it the best time to S rank ratio as far as i can tell. Still, I did this challenge last, after earning progress towards it completing other challenges.Showing all 3 comments. Leave a comment. Thanks for the info. Do you recommend classic or casual difficulty?Posted by Xtowers on 08 Aug 14 at 15:56 I think I was on classic, but I don't think it matters to the challenge. Most of my dragons are pretty high level so I wouldn't have noticed much of a difference.Posted by Chucklestyle on 08 Aug 14 at 17:48 This unlocked randomly for me, I have done like 6-7 missions with S only and it unlocked lolPosted by Michel on 09 Aug 14 at 23:09 Leave a comment