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.
