A weapon that might drop in the first mission for you may not drop until the last mission for someone else due to this randomness. They have a chance to drop all the other shotguns as well. It works the same way when you find an enemy with a shotgun. One always drops a different SMG, the other always a different assault rifle. There are a few exceptions to this but in a lot of missions, like 'Operation Phoenix', you could keep killing the first two enemies over and over again. When starting a mission, it will give each enemy of a class the same weapon. Their class stays the same but their weapon changes on each playthrough (for example, if they have SMGs they will change SMGs on each replay). The way weapon drops work is that each enemy is assigned a weapon class. Four weapons are available from the start and cannot be scanned: NV4, EBR-800, FHR-40, Kendall 44 (which makes 26 total weapons). After scanning a weapon, you must reach the next checkpoint for it to save. You can get all the missing collectibles using mission select (weapons scans, equipment upgrades, SDF Aces and Captains). Most weapons from enemies and armories are randomized. If a weapon does not spawn, restart the mission until it does. Five weapons are random drops from enemies while the other 17 have fixed spawn locations where you can always find them. Search the indicated locations to scan all 22 weapons and get the 'Gun Nut' achievement. Do not keep playing the game with the same weapons and loadout to complete more challenges and get more Salvage.

Certain challenges are limited to certain types of weapons - so keep rotating your loadout. Higher level players get more Salvage points. You can keep track of the challenges in the top right corner. You will get certain challenges (such as getting a certain number of headshots or kills) depending on the team you have joined in Multiplayer mode. The third way to get it is from completing challenges. You can also get it from duplicates you get from Supply Drops.

The amount of Salvage points you get depends on the rarity of the Supply Drop. To craft weapons, you must gain access to the Prototype Lab and unlock the base model of the desired weapon you wish to craft before you can craft its prototype versions. Salvage is used to craft variants of weapons (common, rare, legendary, and epic) to create new prototypes with bonus perks and abilities (such as improved damage, control, less recoil, and accuracy). Salvage is a new currency that you can earn multiple ways in Multiplayer mode. Getting Salvage points and crafting weapons Although you cannot reload checkpoints or restart after death, you can pause and save and exit the game to return and play it again later. In YOLO mode, you die just as quickly as you do on the highest difficulty, but when you die for the first time, you start the game from the beginning. Successfully complete the campaign on the Specialist difficulty to unlock the YOLO difficulty.

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