This pack is from level 100-155 max ran in Call of duty Moder Warfare 5 star General V where you unlock special rare blueprint for max level . And with each rank from 56-155 you unlock a special Officer Challenge. Similar to Daily Challenges  In addition, you are granted a special Seasonal Ribbon.Earning 10 ribbons gives you a special Season Emblem, with each additional 10 ribbons evolving that emblem.