Aliens: Dark Descent

All weapons must be brought using ‘materials’ in the workshop once you get on the ship. Be careful that you don’t waste material on slots for characters. Also be careful for events that pop up between mission that you need to choose an outcome, as some can make you loose or gain depending what you select.

Materials are found in missions in boxes as you progress. Open every box you see for chance for it to be materials. Before selecting a mission it says how much material is on said mission. You can go back on some maps to mop up missed ones on some maps.

I played through and this unlocked mission 10 for me. I had used some points in my playthrough to unlock slots for some of my characters but still had enough.