Successfully complete Mission 31. All nuclear weapons at the FOBs of everyone in your game platform's region must be dismantled. To qualify, you must not own or have a nuclear weapon in development. You must dismantle any nuclear weapons in your arsenal. Additionally, all nuclear weapons on the regional server for your game platform must be dismantled so the total amount of nukes for your platform and region is zero. After all conditions are met, the hidden nuclear disarmament ending will appear after you return to Mother Base or after you complete a main mission. If new nukes are developed afterwards, the ending will not be available again until all the previous conditions are met.