When playing through the campaign of Modern Warfare 3 players will have to put a little extra work into expanding their gear options when deploying into missions. Depending on the mission, players will start the mission with a variety of gear, although often limited and sometimes not best suited for the task at hand. Players can change the weaponry available to them, and unlocked items can be accessed at the start of the mission or when necessary in the mission by accessing one of the many loadout crates scattered in the playable area. Once unlocked, the weapons, field upgrades, and tactical equipment found can be used on any difficulty, allowing players to gear up on an easier difficulty and go into Hardened or Veteran playthroughs fully kitted.