The heart of the Harpoon modern wargame is its information-packed Data Annex. This 1990-91 edition is the latest version, edited and updated by Harpoon designer Larry Bond. This latest edition of the Harpoon Data Annex is included in current copies of Harpoon. If you bought Harpoon before mid-1990, you can update your game with the Harpoon Data Annex.