Grenade Bags (or Boxes) contain grenades for the player to pick up throughout the Call of Duty series. In some cases, a grenade box is the first time the player will encounter grenades in a level. In Call of Duty and United Offensive, grenade bags can be found at preset locations and cannot be picked up from troops. From Call of Duty: Finest Hour onwards, grenade bags are dropped by enemies in their respective campaign.