Sirius defense forces

### Head of military

security council, Commander-in-Chief Fleet/Chief of Naval Operations, Commander-in-Chief of the Office of Naval Intelligence,

### leader

erisa Asuka (明日香絵里沙)

The **sirius defense forces (シリウス防衛軍)** is the military of the diclonius.

## mission

the SDF's statement of function can be summarized in two points:

* Uphold and advance the policies of sirius.
* Ensure the safety and security of sirius.

## Structure

Ultimate authority to direct the actions of the SDF's armed forces lies in the queen. The authority under the queen is absolute, though the leader of the SDF Security Council is the principal commander of all military assets and is authorized to act in the queen's stead regarding matters of defense. The Security Council acts as the principal staff element of the SDF and is responsible for policy development, strategic planning, resource management and fiscal evaluations. The Security Council is staffed by the highest-ranking officers from the Navy, Marine Corps, Army, Air Force and Office of Naval Intelligence.

Below the SDF Security Council is the SDF High Command, or HIGHCOM - the SDF's joint staff and executive body. Senior HIGHCOM officers report to the Security Council, but they primarily serve to coordinate joint and inter-agency protocols and objectives. HIGHCOM controls a wide range of sensitive and strategically vital officers and boards including the SDF Inspector General, General Officer Review Board, SDF Special Topics Committee and SDF Ordnance Commission. HIGHCOM are based at the defense base. Other organizations included within HIGHCOM are a number of administrative commands, including SDF Personnel Command, the Medical Corps, the Engineering Corps, Human Resources, and Astrophysics. Legal matters such as the issuing and enforcement of protocols are handled by the SDF Judge Advocate General's Corps. Research designed to improve the SDF's operations is carried out by the Internal Audit office.

Overall, HIGHCOM ensures that the SDF's component branches work in close coordination.

* **sirius defense forces**
	+ SDF Security Council
		- SDF High Command
		- SDF Personnel Command
		- Unified Ground Command
		- SDF Astrophysics
		- SDF Medical Corps
		- SDF Engineering Corps
		- SDF Testing and Evaluation Command
		- SDF Ordnance Commission
		- SDF navy
		- Naval Command
		- Fleet Command
		- **Office of Naval Intelligence**
		- **Signal Corps**
		- **Logistical Operations Command**
		- **Office of Investigations**
		- **Naval Special Warfare**
		- **Marine Corps**
		- **Marine Infantry**
		- **Marine Aviation**
		- **Marine Logistics**
		- **Marine Military Police**
		- **Marine Special Operations**
		- **Army**
		- UNSC Army Infantry
		- **Air Force**

## Combatant commands

The SDF is divided into two primary combatant commands - Naval Command and Unified Ground Command. The former controls all space and sea-based assets and operations, while the latter focuses on terrestrial and close-orbit missions. NAVCOM has administrative control over the Navy and its officers alongside select Marine Corps units. UNICOM has operational authority over SDF Army and Air Force deployments and some Marine units, and work alongside the Navy to coordinate support.

NAVCOM and UNICOM form joint task forces that are thus then assigned to one of three Central Commands - responsible for the defense and security of a given region, referred to as CENTCOM Regions. forces assigned to one CENTCOM cannot be moved to another without the approval of HIGHCOM. UNICOM planetside forces are organized into task forces that contain ground, air and maritime combat assets.

## Military departments

The SDF's armed forces are comprised of five major military departments. The Office of Naval Intelligence is a unique case; an organization that is bureaucratically a subordinate service of the Navy and not recognized as an independent service branch, but has enjoyed *de facto* autonomy from the Navy. Despite these technicalities, these five organizations are all on occasion informally referred to as the five branches of the SDF

The military departments themselves are broken down into two major groupings; the **SDF Defense Force** and the SDFEF. The former administers defensive assets of the SDF and encompasses the Army and Air Force, while the latter includes Naval and Marine Corps forces.

### Navy

The Navy (海軍) is the senior service of the SDF. The SDF Navy is commanded by the Commander-in-Chief of Naval Operations, with a Deputy Chief of Naval Operations serving as her deputy. The Chief of Naval Operations serves as the Navy's representative on the SDF Security Council. The Chief of Naval Operations also serves as the Commander-in-Chief Fleet.

The SDF Navy operates, trains, organizes and equips space and sea forces to establish local naval superiority. This force is used for the purpose of destroying or suppressing hostile components. The Navy ensures the safety of trade and commerce. The SDF Navy is headquartered at Fleet Command Headquarters on nexus.

The Navy's collateral functions include;

* transportation of SDF combat assets.
* Development of doctrine, procedures and equipment that are of common interest to the Air Force and Marine Corps.
* Providing forces for joint aerospace and terrestrial operations, in accordance with SDF doctrine.
* Coordinating with civil agencies for the establishment and maintenance of naval depots and yards.

The Navy has a dual chain of command; administratively, Navy personnel report to NAVCOM while operationally they report to their assigned Task Command. There are three Task Commands under NAVCOM;

* SDF Navy Fleet Command - Headed by the Secretary of Fleet Command and directs the movement and tasking of naval squadrons and coordinates with UNICOM. FLEETCOM is responsible for the deployment of Navy warfighting assets and maximizing their combat efficacy. Their direct deployment of the SDF fleet sees them as the largest and most powerful of any NAVCOM grouping.
* SDF Navy Logistical Operations Command - Oversees the design and construction of Navy craft alongside making sure that Navy warships are space and sea worthy and supplied with parts, munitions, food and reaction mass.
* Naval Special Warfare Command - A smaller, culturally-distinct section of the Navy that trains, equips and oversees special forces personnel in support of SDF space and sea operations. Marine Corps special forces units are typically tasked under NAVSPECWARCOM.

Navy warships are assigned to fleets, which are organised in one of two ways;

* Expeditionary fleets - Numbered fleets designed for offensive operations and centered around massive carriers.
* Defensive fleets - Named fleets typically named after the region in which they are based.

Fleets are assigned to numbered numbered Sectors. Special task forces may also be created without being assigned to a sector, and given responsibility for regions. Fleets are comprised of numerous battle groups, flexible combat elements that can be "plugged together" into ad-hoc fighting forces depending on the immediate situation. Squadrons serve as administrative groupings of warships for record-keeping and honorific purposes.

The UNSC Navy maintains its own military police force

### Marine Corps

The SDF Marine Corps (海兵隊) is another senior service of the SDF. The Marine Corps is the naval infantry department of the SDF, and works closely alongside the Navy to effect military action. The administrative head of the Marine Corps is the Commandant of the Marine Corps, who serves as the Marine Corps' senior general and service representative on the SDF Security Council and Unified Ground Command staff. The CMC is responsible for organising, planning and implementing all Marine Corps activities. The Marine Corps is headquartered at Fleet Command Headquarters. The Marine Corps is responsible for maintaining an expeditionary force in readiness, which can seize and defend terrestrial and extraterrestrial strategic sites in advance of a larger main SDF deployment. As such, the Marine Corps organizes, trains, equips and maintains land, air, sea and space-based combined-arms teams capable of being rapidly deployed by the Air Force and Navy. They are the general-purpose combat force of the SDF, and employ a wide range of personnel from sharpshooters to combat engineers to xenolinguists. Marine Corps forces are under administrative control of Marine Corps Forces, which focuses on the ability to reorganize, train and direct a given unit's long-term activities. Operational control of combat forces is handed to one of two combatant commands; Naval Command and Unified Ground Command - which provides the authority to conduct missions and delegate tasks, but not the ability to alter the internal organization of subordinate units.

Marine Corps forces are unusual in that they may transition back and forth between combatant commands in combat zones, synchronized by Joint Deconfliction Teams. Marine Corps forces assigned to NAVCOM form a unit referred to as Fleet Marine Forces, under the operational control of FLEETCOM command. Fleet Marine Forces include Marines assigned to shipboard and facility security, boarding parties and most aerospace and sea assets. Landing parties and expeditionary ground combat elements remain under the jurisdiction of NAVCOM, though this reading of the regulations is vehemently contested by UNICOM. Conversely, Marines conducting long-term security missions, train-and-equip details and force augmentation for SDF garrisons fall under UNICOM control.

The Marine Corps' collateral functions include;

* Enforcement of emergency military law in designated crisis areas.
* Development of doctrine, procedures and equipment that are of common interest to the Army and Navy.
* Furnishing security teams for the protection of SDF property and high-value personnel.
* Deployment of security detachments and organizations for service on Navy ships.
* Development of doctrine, tactics, techniques and equipment for the rapid deployment and utilization of interstellar combat power.

Marine Corps forces are typically deployed as part of a Marine Expeditionary Force, which may encompass several divisions as subordinate units and is itself subordinate to Fleet Marine Forces.

xx - Division - 14,000 Marines led by a Major commander and deployed as a Marine Expeditionary Unit
x - Marine Brigade/Marine air wing - 9,000 Marines led by a Brigadier commander and deployed as a Marine Air Wing
••• - Platoon - 40 Marines led by a Second Lieutenant or Staff Sergeant and deployed as a unit assigned to a frigate
•• - Squad - Thirteen Marines led by a Corporal or Sergeant
• - Section - Eight Marines led by a Lance Corporal or Corporal
Ø - Fireteam - Four Marines led by a Lance Corporal or Corporal
Marine special operations forces are typically deployed under the control of Naval Special Warfare Command.

### Army

The SDF Army (軍) is the primary terrestrial department of the SDF, and provides the majority of the logistical support and reservist soldiers who fight in ground campaigns. The Army is responsible for defense of territorial holdings and the long-term occupation of enemy territories, and as such trains, organises, equips and maintains amphibious, land and airborne forces for this mission. As such, while all Army soldiers are trained warfighters, in peacetime they also provide an invaluable force of engineers, technicians, builders and designers who perform public works and improve existing colonial infrastructure to support future SDF deployments. The Army also maintains its own Corps of Engineers for performing some of the duties listed above, alongside the Army Security Forces for the purpose of military policing.

The Army's collateral functions include;

* Conducting civil works that have strategic application.
* Development of doctrine, procedures and equipment that are of common interest to the Air Force and Marine Corps.
* Organisation and training of civil defense units.
* Providing forces for joint aerospace and space operations, in accordance with SDF doctrines.

Army forces have been historically administratively organised under the control of specialised local commands. Operational authority of Army forces is granted to UNICOM.

The Army operates its own special forces such as the Army airborne, Pathfinders and Army Rangers - who are presumably organised under Unified Special Warfare Command, or simply Special Warfare Command. SPECWARCOM organises its detachments into "Groups, as well as specialised maritime forces colloquially referred to as the "wet navy". Army submarine arsenal ships and aircraft carriers are vital components in defense.

### Air Force

The SDF Air Force serves as the primary air combat department of the SDF. Contrary to their name, the Air Force does not simply operate aircraft within a planetary atmosphere, but instead focus on maintaining aerospace superiority via the use of unmanned drones, crewed aircraft and orbital weapon platforms. The Air Force operates a network of quick rapid reaction Squadrons, which are prepped and ready to deploy atmospheric fighter craft and military spaceplanes at a moment's notice. These strikecraft work alongside surveillance and weapons satellites to attrition an attack and assist Navy elements on station. The Air Force's atmospheric forces are primarily comprised of unmanned drones, though they are augmented by crewed craft.

The Air Force's collateral functions include;

* Deployment and maintenance of SDF unmanned defense satellites and orbital weapon platforms.
* Monitoring and regulation of military and civilian orbital activites.
* Development of doctrine, procedures and equipment that are of common interest to the Army and Navy
* Furnishing support and space support for the Army and Navy.

Air Force units may be expeditionary or garrison in nature, with the largest overall groupings named Groups and Wings, respectively. A given Group/Wing is a larger organisation within the Air Force that combines several air Squadrons with non-aircraft units to provide specialised functions. Squadrons consist of two to six Flights plus additional command and technical elements, and are typically named by a number and a mission type, while a Flight consists of three to four individual aircraft and their support personnel. Flights are officially identified by a phonetic letter designation, though most also get an informal nickname.

Air Force orbital defense platform assets are grouped under the Orbital Defense Command, while regular air combat operations are conducted under the Air Combat Command. The Air Force also maintains its own signals intelligence division and the Air Mobility Express - who work to provide airlift and spacelift capacity for the SDF. The Air Force often employs Army maritime forces as launch platforms for its operations, using roving watercraft and carrier platforms to vector strikes against targets from outside the enemy's sensor horizon before retreating to underwater staging areas.

The Air Force was the first service department to directly collaborate with the newly-established Spartan Operations branch, funding a joint-operations laboratory to test novel ways in which super-soldiers can augment their capabilities and certifying Spartan-IV personnel as pilots for next-generation fighters.

### Office of Naval Intelligence

The Office of Naval Intelligence (海軍情報局) is the preeminent intelligence service within the SDF. The organisation is ostensibly and bureacratically subordinate to the SDF Navy, though in practice retains almost complete autonomy. This has seen ONI take over the duties of previously-independent agencies to become the sole major intelligence organisation in sirius. ONI is headed by the Commander-in-Chief of the Office of Naval Intelligence, who is granted a seat on the SDF Security Council. ONI remains closely-linked with the Navy in terms of administration and overall culture.

ONI's collateral functions include;

* Deployment of covert teams for direct action and technical data collection.
* Oversight of the gathering, analysis and dissemination of national security information.
* Development of doctrine, techniques and equipment for the collection and exploitation of information in support of sirius security.
* Providing combat support intelligence for SDF operations.
* Establishment of covert observation systems around hostile planets and facilities.

To achieve its goals, ONI is divided into five sections that each specialise in different aspects of intelligence gathering, analysis and dissemination. Each section in turn, has its own compartmentalised teams dedicated to more specific long-term taskings and program management.

* Section Zero - Section dedicated to internal affairs and security audits.
* Section One - Section dedicated to military intelligence gathering and analysis.
* Section Two - Section dedicated to information operations and public relations.
* Section Three - Section dedicated to special acquisition, research and development projects for the SDF.
* Section Four - Clandestine survey group that conducts xenoarchaeology and planetary survey studies.

## Military assets

### technology

The diclonius's technological achievements are very advanced. it can be split into three types: nexus tech, rhinelan tech and kasari tech.

nexus tech is known for its dark appearance and relying on hardened tribinium.

rhinelan tech is known for its geometric appearance

kasari tech is known for its curved, organic and sophisticated looking style,

SDF armory