set_oobCOUNTRYnoneRegisters an Order of Battle (OOB) file to be loaded for a country at game start, replacing any previously registered OOB (with no key) on that country.
Only intended to be used within history files.
Example:
set_oob = "ENG_1936"
实战内容由 AI 生成,并已对照 vanilla 命令词表校验 —— 请当作起点而非权威依据。上方的定义节才是游戏自带文档原文。
set_oob 主要用于在历史文件（history/countries/）中为国家指定开局部队编制文件，也常见于 mod 中为新增国家或替换国家指定自定义 OOB。当 mod 需要彻底重塑某国的开局军队构成时，只需在该国的历史文件顶层执行块中调用一次即可覆盖原有注册。
# history/countries/ENG - Britain.txt
capital = 123
set_oob = "ENG_1936_mymod" # 使用 mod 自定义的部队编制文件
[division_template](/wiki/effect/division_template)：OOB 文件内引用的师团模板需要事先在历史文件中用 division_template 定义，两者共同决定开局部队的外观与能力。[add_ideas](/wiki/effect/add_ideas)：通常在同一历史文件中与 set_oob 并列，用于赋予国家开局国策思潮，使军队编制与国家状态同步初始化。[add_manpower](/wiki/effect/add_manpower)：搭配使用以确保国家拥有足够人力来支撑 OOB 中定义的部队，避免出现人力为负的情况。set_oob 设计上仅用于历史文件的初始化阶段，若将其写入 country_event 的 option 块或 hidden_effect 等游戏中触发的效果块，行为不可预期，游戏内动态修改部队编制应改用其他手段（如 create_corps_commander、delete_units 等组合）。set_oob = "ENG_1936_mymod" 对应的实际文件必须放在 history/units/ENG_1936_mymod.txt，文件名大小写需与字符串完全一致，否则游戏开局时该国部队将静默缺失，且不会有明显报错提示。Hands-on notes are AI-generated and checked against the vanilla command vocabulary — treat them as a starting point, not authoritative reference. The definition above is the game's own documentation.
set_oob is primarily used in history files (history/countries/) to assign an order of battle file to a nation at game start, and is commonly seen in mods to specify custom OOBs for new or replaced nations. When a mod needs to completely reshape a nation's starting army composition, it only requires a single call to set_oob in the top-level effect block of that nation's history file to override the original registration.
# history/countries/ENG - Britain.txt
capital = 123
set_oob = "ENG_1936_mymod" # Use the mod's custom OOB file
[division_template](/wiki/effect/division_template): The division templates referenced in the OOB file must be defined beforehand in the history file using division_template. Both work together to determine the appearance and capabilities of your starting units.[add_ideas](/wiki/effect/add_ideas): Typically paired with set_oob in the same history file to grant the nation starting national focuses, ensuring the army composition and national state are initialized together.[add_manpower](/wiki/effect/add_manpower): Use alongside set_oob to ensure the nation has sufficient manpower to support the units defined in the OOB, preventing negative manpower situations.set_oob is designed solely for initialization in history files. If placed in the option block of a country_event or other in-game triggered effect blocks like hidden_effect, behavior becomes unpredictable. For dynamic unit composition changes during gameplay, use alternative methods instead (such as combinations of create_corps_commander, delete_units, etc.).set_oob = "ENG_1936_mymod" reference requires the actual file to be located at history/units/ENG_1936_mymod.txt. Filename casing must match the string exactly; otherwise, the nation's units will silently fail to load at game start with no clear error message.