Earning 10 ribbons awards an Emblem, and all 100 ribbons gives you an even more badass Emblem. Completing each challenge rewards a ribbon.
THEN, AT THE START OF EACH SEASON OF CONTENT… Gain experience for each weapon to earn attachments and base camouflage patterns, and complete camo challenges to complete camo sets. Rank up your weapons individually though the weapon progression system.Rank up through the Enlisted Ranks (1-55) to unlock base weapons, perks, equipment, Killstreaks, and Field Upgrades.
To reiterate how progression works in Call of Duty: Modern Warfare, you will: That means the Officer Ranks will indeed be reset at the beginning of a new season, though they are permanently recorded alongside other milestones such as Officer Challenge Ribbons and Seasonal Emblems.