Field Manuals are collectibles featured in the singleplayer campaign of Battlefield 1. A total of sixty-six manuals are available for collection across five missions in the campaign. Once found, the player must open the box containing the manual and pick it up in order for the manual to be counted as collected. Upon completing a mission and obtaining all manuals and Codex Entries within it, a special weapon or vehicle skin will be unlocked for use in multiplayer.