Federal Maritime Defense Force¶
The Federal Maritime Defense Force (FMDF) — Kaijō Bōeitai — is the Federation's first-rank service and the principal instrument through which the Federation conducts deterrence and diplomacy in the Senshi Sea. 95,000 active personnel + 25,000 trained reservists, including the Naval Air Arm. The FMDF is among the world's top-tier maritime forces — carrier-equipped, submarine-strong, and structurally aligned with the FSA 7th Fleet through the Open Sea Lanes arrangement.
The principal naval base is at Akehoshi Naval Base on the eastern coast of the central island; the principal counter-Xianren homeport is Senshi-port Naval Base on the Saikoku western coast. Carriers, surface combatants, and submarines are all built domestically.
Doctrine¶
FMDF doctrine is carrier-led, submarine-strong, and SLOC-defensive. The principal missions:
- Senshi Sea SLOC security — the Federation's energy and food imports transit the Senshi Sea; their protection is the FMDF's central peacetime mission
- Carrier strike group operations — the two Hinomori-class flagships are the Federation's principal force-projection capability, embedded under treaty constraints in collective security contexts
- Submarine ASW + commerce defence — the 22-strong Kairyū-class AIP submarine fleet is the world's largest conventional submarine arm, sized explicitly to deter Xianren
- Joint operations with FSA 7th Fleet under the 1985 Open Sea Lanes arrangement
- Strategic amphibious lift for the Amphibious Rapid Brigade
- Sea-based ASW + maritime patrol — Kairyū-class submarines + P-1 land-based MPA
Force structure¶
The FMDF is organized under FMDF Fleet Command (Akehoshi) (Fleet Command):
Senshi Fleet (operational)¶
| Formation | Composition | Mission |
|---|---|---|
| Trägergruppe Hinomori (1st Carrier Group) | HMS Hinomori (CV-83) + 2 Kongō / Maya / Atago / Akizuki-class DDGs + 2 Mogami-class FFGs + air wing | Carrier strike — apex naval force; flagship of the Senshi Fleet |
| Trägergruppe Shōkaku (2nd Carrier Group) | HMS Shōkaku (CV-84) + 2 DDGs + 2 FFGs + air wing | Second carrier strike group; alternating cycle with Hinomori for continuous readiness |
| Northern Surface Group | 3 Kongō-class DDGs + 2 Mogami-class FFGs | Northern Ocean surface action; Hokutō Naval Station |
| Western Surface Group (counter-Xianren) | 1 Kongō-class DDG + 2 Mogami-class FFGs + 2 Shimakaze-class corvettes | Senshi-port front-line; counter-Xianren posture |
| Kairyū Submarine Flotilla | 12 Kairyū-class SSKs (operational); 10 more in reserve rotation | Submarine flotilla — homeport at Senshi-port; the world's largest conventional submarine arm |
Aviation + functional commands¶
- Imperial Naval Aviation Command:
- Naval Air Group 1 through 4 — P-1 Kawasaki maritime patrol (28 aircraft, 4 squadrons of 7); world-class ASW capability
- 1st + 2nd ASW Helicopter Squadrons — SH-60J / SH-60K NH-90 NFH-equivalent
- 3rd MCH-101 Squadron — AEW + MCM
- Carrier air wings aboard Hinomori + Shōkaku — F-35B + E-2D + EA-18G + MV-22 + SH-60K
- Amphibious Flotilla — 2 Akagi-class LHD; 3 Ōsumi-class LPD/LST
- Mine Warfare Flotilla — 12 Awaji-class MCMV
- Replenishment Command — 5 Mashū-class AOE + 8 underway-replenishment AOR
Principal vessels¶
Carrier¶
HMS Hinomori (CV-83) — Hinomori-class fleet carrier. Approximately 27,000 tonnes displacement; conventionally powered (steam catapults, no nuclear plant — the Federation is Protocols-compliant); CATOBAR design enabling F-35B Lightning II STOVL operation. Air wing typically embarks:
- 14 F-35B Lightning II (1 squadron)
- 6 MV-22 Osprey tiltrotor (1 squadron)
- 6 SH-60K ASW helicopters (1 squadron)
- 4 E-2D Hawkeye AEW (1 squadron)
- 4 EA-18G Growler electronic attack (1 squadron)
Built at Kobetsu Steelworks (Akehoshi shipyard) over a 9-year program; commissioned 2019. The Federation's flagship carrier and the Emperor's traditional Spring Review embarkation. The Hinomori bridge watch on Spring Review day is the single most prestigious assignment in the FMDF.
HMS Shōkaku (CV-84) — sister ship; commissioned 2024; provides continuous-availability second-carrier capability with Hinomori on alternating cycle.
Surface combatants¶
| Class | Type | Hulls | Notes |
|---|---|---|---|
| Maya-class | DDG | 2 (DDG-179, DDG-180) | Aegis BMD; flagship escort for carrier group |
| Atago-class | DDG | 4 (DDG-177 + DDG-178 + 2 others) | Aegis-equivalent; carrier escort |
| Kongō-class | DDG | 4 (DDG-173 through DDG-176) | Aegis; northern + western surface groups |
| Akizuki-class | DDG | 4 (DDG-115, DDG-116 + 2 others) | General-purpose; ASW + AAW |
| Mogami-class | FFG | 22 hulls (FFG-1 through FFG-22) | Multimission stealth frigates; principal fleet workhorse |
| Shimakaze-class | FS | 8 hulls (FS-31 through FS-38) | Coastal corvettes |
| Hayabusa-class | PG | 15 hulls (PG-001 through PG-015) | Missile patrol craft |
Submarines¶
| Class | Type | Hulls | Notes |
|---|---|---|---|
| Kairyū-class | SSK (AIP) | 12 active + 10 reserve (SSK-501 through SSK-522) | Modern lithium-ion battery AIP submarines — domestic design; the world's largest conventional submarine fleet; principal counter-Xianren capability |
The Federation does not operate nuclear-powered submarines. The constitutional prohibition on strategic nuclear weapons is extended doctrinally to nuclear-propulsion as a matter of policy continuity.
Amphibious¶
| Class | Type | Hulls | Notes |
|---|---|---|---|
| Akagi-class | LHD | 2 (LHD-01, LHD-02) | KMS Akagi + KMS Kaga; ~30,000-tonne amphibious assault ships with 6-spot flight deck + well deck; each lifts a Marine Battalion Landing Team |
| Ōsumi-class | LPD/LST hybrid | 3 (LPD-4001 through LPD-4003) | KMS Ōsumi + Shimokita + Kunisaki; dock landing ships, complement the LHDs |
Coastal defense — joint with FGDF¶
The Type-12 SSM coastal anti-ship missile system is operated jointly with the FGDF. ~30 batteries distributed across the Senshi Sea coast of Saikoku + Hokutō. The system is the FMDF's principal land-based contribution to the counter-Xianren posture.
The Open Sea Lanes arrangement (1985 onward)¶
The most operationally significant bilateral mechanism in the FMDF's operating life is the Open Sea Lanes Agreement with the Federated States of Arcadia. Under it, the FMDF and the Arcadian 7th Fleet jointly patrol the Sierran Approach sea lane, with formal coordination via:
- Two Hinomuran liaison officers permanently embedded at the 7th Fleet HQ
- Two Arcadian liaison officers at Akehoshi Naval Base
- Real-time IFF / blue-force tracking across the joint operational area
- Joint ASW exercise series annually
- Shared maritime patrol overflight rights
The arrangement has been continuously active for forty-three years. It is the most operationally durable defence arrangement in Brassican history.
Operational status¶
The FMDF has been expanded operationally since the Continuation War began without changing the Federation's formal neutrality:
- Port access to Arcadian fleet movements has been granted continuously
- Southern Senshi Sea ASW patrol cadence has been raised
- A second carrier (HMS Shōkaku) is now in continuous alternation with HMS Hinomori
- Xianren naval activity in the Senshi Sea has remained at structural background levels, not elevated
The Reformist Bloc's constitutional-revision agenda explicitly contemplates authorization for FMDF combat participation in collective security operations. The Constitutionalist Bloc opposes. The debate over the FMDF's role is the principal expression of the broader constitutional debate.