– On your first playthrough of the missions, always try to take out the enemy radar stations. With these items you are limited to A-rank at best. – Equipping the Invisibility Camo, Parasite Suit, Raiden Suit, Cyborg Ninja Suit, Chicken-Hat, Infinity Bandana, using D-Walkers Fulton Ballista or calling in air strikes / helicopter support will void the S-rank. Skip the bonus objectives, they take too long and will complicate things. – Completing the missions as quickly as possible without being seen is usually good enough. Main missions 02, 22, 43 are an exception, they don’t have any ranks. – Only main missions have a ranking system, side ops don’t. – Getting 130,000 points in a mission unlocks the S-rank (same score requirement for all missions)
S-Rank Strategies, basic tips and things you should know: