Japan's Self-Defense Forces
BGG rating
10.0

Expansion for Harpoon V: Modern Tactical Naval Combat 1955 - 2020

Japan's Self-Defense Forces

2026

Rules assistance for Japan's Self-Defense Forces

Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

  • 1–8 players
  • 12+

Rules assistant for Japan's Self-Defense Forces

What would you like to know?

Answers come from the official rulebook, with the page to check.

Japan's Self-Defense Forces is an expansion for Harpoon V: Modern Tactical Naval Combat 1955 - 2020 released in 2026 for 1–8 players and ages 12 and up. Its main mechanics are Dice Rolling, Paper-and-Pencil, and Simulation.

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About the game

Japan’s Self-Defense Forces covers all ships and aircraft in Japanese service from 1955 to the current day. It is designed as a sourcebook for Harpoon, fifth edition, but it can also be used as a general reference. Organized as a collection of annexes, Annexes and B provide statistics on ships and aircraft respectively as first built, and any modifications over time, sometimes many times. Annexes C and on give detailed weapons and sensors characteristics, including guns, missiles, antisubmarine weapons, torpedoes, mines, airborne ordnance, radars, sonars, and data links, with all the information needed to use them in a Harpoon scenario. The book also provides information on land-based surface-to-air missiles systems, coastal defense missiles and their battery organization. Supplemental annexes list ship classifications and factors used to convert weapons and sensor information into game data. As a bonus, in addition to having information on the characteristics of Japanese ships, planes, weapons and sensors, it includes data on the how the ships are organized into flotillas and divisions, and aircraft into squadrons, and where they all are based. Another map shows Japan’s air defense regions. —description from the publisher

Questions and answers

Japan's Self-Defense Forces supports 1–8 players according to the catalogue. This range comes from the publisher’s listed player count, so the game can be set up for any group size within it. Some setups, rules and scoring details may still vary by player count, so check your edition’s rulebook for the exact configuration.