Some rules I've been working on.
Gas masks are required to carry artifacts, they must be worn while carrying one.
But, not everyone owns one (if you do then you start with one), so you can purchase one (A painter's mask) at the bank for ~$500.
Medikits can be used to bring someone back to life right on the field.
They cost ~$500 but can bring someone alive (once) before they have to go back to the base to respawn, they will be put around your arm.