Official rule text
99.3 After the active player resolves the primary ability of the “Warfare” strategy card, each other player, beginning with the player to the left of the active player and proceeding clockwise, may spend one command token from their strategy pool to resolve the “Production” ability of one space dock in their home system. a The command token is not placed in their home system. RELATED TOPICS: Action Phase, Command Tokens, Initiative
View official source
Source: Living Rules Reference and FAQ - Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 99.3