Infinity Ward has changed how players kit up and customize gear for missions in the Call of Duty: Modern Warfare 3 campaign. Featuring Open Combat Missions that function similarly to Warzone or DMZ, players will have to find and scavenge equipment from around the mission area to add the weapons and equipment to the mission arsenal. Once a weapon, field upgrade, or tactical equipment is found, the item will become permanently available at the start of the campaign mission when creating a loadout. These items transfer across difficulties as well, meaning players can go through on Recruit or Regular difficulty and find all the supply crates to have the weaponry available on a later replay on Hardened or Veteran difficulty.