Salvage is a type of currency in Call of Duty: Infinite Warfare. It is earned by simply playing the game, completing Mission Teams levels, converting duplicated Supply Drop items and through earning daily bonuses, and can be used to purchase Prototype Weapon variants or supply drops in certain bundles. These variants often have traits which improve the weapon, similar to Weapon Variants from Call of Duty: Advanced Warfare.
It costs 200 to craft a Common weapon, 500 for a Rare weapon, 2000 for a Legendary weapon, and 4000 for an Epic weapon.
Salvage is given multiple qualities, most often appearing in a Common quality. The amount of Salvage found in a supply drop determines the quality of the card. Salvage is also given as a bonus item in Rare Supply Drops, which stacks with any amount of Salvage unlocked in a supply drop.
During the 12 Days of Winter Supply Drop event, 200 and 500 Salvage were given on Day 3 and Day 9 respectively.