The OOM-series battle droid, alternatively referred to as the OOM-mark, represented a specific variation within the larger family of B1-series battle droids. This line included specialized units like OOM command battle droids, OOM pilot battle droids, and OOM-series security droids. These droids participated actively in events such as the Invasion of Naboo and were deployed extensively throughout the Clone Wars. Notably, B1-268 served as an OOM command battle droid under the command of General Kalani within the Separatist holdout situated on Agamar during the early rebellion against the Galactic Empire.
OOM command battle droids, OOM pilot battle droids, and security battle droids each fulfilled unique roles, distinguished by their distinct color markings.
- OOM-series security droid — Designated as Specialist Droids, these battle droids were engineered for security purposes [6]. [15] They were easily identifiable by their prominent red markings located on the back of their heads and bodies. The Trade Federation utilized them during the Invasion of Naboo [8], and they were subsequently integrated into the Separatist Droid Army. Their duties included providing security at locations such as the prison known as the Citadel [9], or aboard the Providence-class Dreadnought Invisible Hand [10]. They also functioned as snipers and specialized infantry in battles against the Republic [15].
- OOM pilot battle droid — These battle droids were specifically designed to operate starships as pilots, particularly the cruisers belonging to the Confederacy navy [16]. They were also capable of piloting the hijacked Venator-class Star Destroyer named Renown [17]. These battle droids featured distinctive blue markings on the back of their heads and bodies. In addition to piloting, pilot droids could also serve as gunners for artillery or, when equipped with a blaster, function as soldiers [18], although they were known to express dissatisfaction with being assigned to such roles [19].
- OOM command battle droid — These battle droids were distinguished by the dull yellow markings present on their bodies. Equipped with advanced cognitive and tactical modules, these droids were responsible for leading droid forces [16]. While often subordinate to organic officers [8] or tactical droids [11], an OOM command battle droid could assume command of military forces in the absence of a superior officer [20].
The "OOM-series" concept initially appeared within Star Wars Legends for the Roleplaying Game, drawing inspiration from the commander battle droid designation OOM-9. The series name was later incorporated into canon through Star Wars: Build Your Own R2-D2 30.
According to Star Wars: The Complete Visual Dictionary, New Edition, the OOM-series predated the B1-series. However, Ultimate Star Wars from 2015 and Ultimate Star Wars, New Edition from 2019 both feature battle droid pages that classify the model as B1. Consequently, all information on this page applies to the B1 battle droid, while also acknowledging the security, pilot, and command droids that The Complete Visual Dictionary considered predecessors. Furthermore, both editions of Ultimate Star Wars identify OOM-9 as both an OOM command battle droid and a B1 unit. Similarly, the 2019 reference book Star Wars Character Encyclopedia, New Edition includes a battle droid page that identifies the droid type as B1, while also providing information about pilot battle droids. Star Wars Battlefront II and Star Wars: Droidography also confirm that B1s served as pilot droids. The battle droid Databank entry on StarWars.com makes no mention of a model difference, despite including information related to both B1s and OOMs. Star Wars: The Rise of Skywalker: The Visual Dictionary subsequently clarified that the OOM-series represented a mark within the B1 line. Given that most sources establish the OOM-series as part of the B1-series, this article operates under the assumption that Star Wars: The Complete Visual Dictionary, New Edition is inaccurate.