Badge of Service is a CS:GO sticker. It has the rarity of a High Grade Sticker and has a 79.92% chance of being unboxed from a sticker capsule/container.
This sticker can be applied to any weapon you own and can be scraped to look more worn. You can scrape the same sticker multiple times, making it a bit more worn each time, until it is removed from the weapon.
The lowest known price for the Badge of Service is currently $0.07 USD.