RP is now used strictly as Research Points for a number of reasons.

• To reduce penalties from dying while making riskier plays or using more-exotic equipment.
  
• To remove uneven RP economies (having too much due to hoarding or too little due to overspending).
  
• To prevent the armory from auto-sorting by cost, allowing other sorting schemes.

Radio and vehicle calls now operate on cooldowns, enabling free use without allowing spam.

Each radio call or vehicle flare has a specific 'type'. This type could be 'artillery' or 'airstrike' or 'tier 1 vehicle' or 'tier 6 vehicle'. Using a call-in of a given type puts only that type on cooldown, so you can call artillery and an airstrike, or a tank and a jeep, but not two airstrikes or two jeeps at once.

Cooldowns apply across the whole team. There's a radio call to get a report on any active cooldowns.

There are three ways to unlock new items in the campaign, two of which are deterministic.

• Playing the game. Something new will unlock every 20 minutes (at 40% XP mult). This is where you'll get all of your new faction stock and vehicles.
  
• Using research items from the Field Lab. This is used to unlock special items, add normal items to the Supply Quad, or unlock enemy weapons.
  
• Turning in cargo trucks or briefcases. This unlocks a random joke or novelty item. Briefcases can be found in any secret crate or from EODs at a 5% droprate.