TrifeGod
Chasing The Dragon
Soon as I get the last sniper rifle on the list, im cleanin' shopBrehs once you get to the point that you need to farm A++-S++ soldiers to level up good missions to replay are the ones where you fight skulls
Traitor's caravan; metallic archea; where do the bees sleep (whatever it's called) and even code talker if you save the skull fight until after you get code talker.
Keep in mind that to increase the probability of scanning S/legendary soldiers, your heroism and MB level needs to be high. I'm currently at 400k heroism and they appear pretty frequently. (Also upgrade your int. scanner)
I might auto assign everyone after i clean up all the low ranks, then start the farm, I have 10 Legends already 65% A-B and everyone else is flabby n sick