Salvage missions are a good way to get materials. Use the following trick to easily get materials from Salvage mission. Join a Salvage mission session. Unequip all gear so you can sprint directly to the objective. Place the extractor and clear the area of any wanderers. Immediately begin the waves instead of waiting for the timer to complete. Once it begins collecting Iris energy, interact with the extractor and immediately withdraw to end the mission and get rewards simply for starting it. It does not matter the difficulty or rank. Note: You can get better items on harder difficulties.