RP, or Resource Points, acts as the currency for Running With Rifles. RP can be used to purchase items from the Armory and is also used to call for artillery strikes, vehicle airdrops, paratroopers, etc. with the Radio.
RP can be gained by capturing objectives, sabotaging points of interest such as water towers, radio jammers, radio towers and mortar ammunition, delivering enemy cargo trucks to the armory, and selling items at the armory.
Your RP count can be viewed by entering your inventory.