Valhalla-class Destroyer

## Valhalla-class

COINSRG 4-22 - 3 active

Mod 5 - 14 active, 2 planned

Mod 6 - 4 planned

or

- 2x Mk3 bays with 2x TACT78 Vandrefalks

or

- 8x AMAF13 Shrikes (COINSRG 4-22)

- 128x Vakt interceptor missile VLS cells

- 30x Skrømt anti-ship missile VLS cells

The Valhalla-class Guided Missile Destroyer (also referred to as the Atrios-class and Valentia-class) is a space warship class in service with the Nyhavn Romsjøforsvaret (NRSF), originating as a joint project named the Type IV Joint Destroyer Initiative between the United States Navy (USN) and Nya Sverigen Defense Force Navy (NSDFN) and built by Narvel Shipworks. While initially in the service of the USN, variants currently see service of the Nya Sverigen Defense Force Navy and the Brazilian Federation Navy.  The Type IVB is the latest variant in Nyhavn service, seeing major upgrades to system architecture and internal structure as a result of lessons learned in both peacetime operations and the Second Nyhavn-Xin Dongbei War.

The class is named after the Norse warrior afterlife and home to Odin’s armies, Valhalla.  With an overall length of 264 meters and amassing approximately 440,000 metric tons, the Valhalla-class sits on the larger side of comparative destroyers, a product of its large power generation capability.  This excess of power goes towards operating a relatively large suit of weapons systems and a rudimentary hanger, a novelty in ships its size.

#### General Characteristics

The Valhalla-class is a multi-mission destroyer, tasked with providing commercial shipping escort, anti-piracy, and border protection during peacetime operations, and missile generation and area/fleet defense operations during combat.  While less maneuverable due to its size in comparison with its peers, the Valhalla’s armaments are equivalent to a light cruiser, sporting a pair of high rate-of-fire Mk214 180mm coilguns capable of punching far above its weight.

While generally considered costly to operate for the majority of roles it is tasked with due to its high amount of automation and complexity, Valhalla’s modular system architecture and redundancy allow the class to be relatively easy to maintain.

#### Specifications

While larger than its peers at 440,00 metric tons, the Valhalla-class sits solidly in the role of a multi-mission destroyer, providing fleet defense and missile generation capability to a strike force. It is 264 meters long, with a beam and height of 64.5 meters, in compliance with Port Regulation 331.88b and the Menthu Accords.

Beyond the hull form, the specifications vary depending on the Type and Modification.

##### Type IV

The Type IV was the original prototype model of the Valhalla-class, designed with advancement, modularity and easy maintenance in mind, combining a complex sensor and systems suite with a large weapons system. Compared to later versions, the Type IV had a reduced power generation capability and different engines, a result of development originally with one Venture Systems M68 reactor and a triple set of Baykrim Type-5 heavy thrusters.  However, during final prototype trials, the Baykrim Type-5 engines suffered a catastrophic exhaust containment failure, resulting in massive damage to the hull and near total destruction of the onboard trial crew. After a comprehensive investigation, the engines were replaced with the far more reliable Simian and Beckett M1520 thrusters, necessitating a power increase and the increase from the single M68 to two reactors.

##### Type IVA

(USN, NSDFN, NRSF)

Beginning in 2314, the Type IVA was the initial production model run of 27 hulls, 6 hulls to the USN, 13 to the NSDFN, and a cumulative 8 hulls to the NRSF. Sporting an improved safety system, engines, and power production, the Type IVA was a marked improvement over the Type IV. However, the type was quickly found to be lacking in damage control and power redundancy, resulting in a midlife modification upgrade.

###### Mod 1

(USN, NSDFN, NRSF)

Modification 1 or Mod 1 was an incremental upgrade to the Type IVA, updating systems software and improving power redundancy and damage control measures. Released in 2316, the last 6 hulls of the initial NRSF order were built to Mod 1 specifications.

###### Mod 2

(USN, NSDFN, NRSF)

Mod 2 was an incremental upgrade released as a result of lessons learned in the Arma Frontier conflict. Results had shown that the Valhalla's, while well armed and capable, were weak to Chinese cyber attacks, resulting in the temporary disabling of two USN destroyers and the destruction of a third. Released in 2318, the modification was widely adopted by all operators, but the issues persuaded to the USN to cease involvement in the program.

###### Atualização do Sistema 30

(BFN)

AdS 30 was a modification undertaken by the Brazilian Federation Navy upon acquisition of the USS Elliot and USS Fainway, updating their combat networks and sensors to proprietary systems, along with changes to the weapon suite to standard Brazilian naval systems.

##### Type IVB

(NRSF, NSDFN)

The Type IVB is a major production upgrade to the Valhalla, implemented on all subsequent productions in the Nyhavn Romsjøforsvaret and Nya Sverigen Defense Force Navy. The IVB saw a major upgrade of the Valhalla's engines and power production, updating to a 4x S&B M1560 thrusters and two VS M75 reactors. This power increase was not immediately taken advantage of, but saw application in future modifications.

###### Mod 3

(NRSF, NSDFN)

The Modification 4 came about from lessons learned from the second Nyhavn-Xin Dongbei War, in which combat upgrades in the form of ad-hoc weapon additions proved highly successful. The upgrade included an expansion of Skrømt VLS cells from 22 to 30 and the addition of two Mk88s to the bow.

###### COINSRG Refit 3-22

The COINSRG Refit 3-22 was alteration modification to both the Valhalla's hanger and internal operational layout to allow the NRS Bredahl, NRS Michaelsen, and NRS Marklund to carry AMAF13 Shrikes and conduct limited atmospheric aviation operations. Originating from a need for mobile deployable aviation assets during the Afemotu Intervention, 3-22 was designed to provide a stopgap measure in the place of building new dedicated carriers. While partially successful, the program was not continued past the first three initial ships.

#### History

Developed as a joint project between the United States Navy and Nya Sverigen Defense Force, the destroyer was planned as a replacement for the SVDF’s aging Pilspets-class frigate and the USN’s failed Patriot-class area-defense destroyer.  Despite delays, prototype production began in 2306.  In 2310 the Nyhavn Federation expressed interest in the program and took on an observer status in 2311.  In 2313 mainline production began at Narvel Shipworks on Nya Sverige, with the USN ordering a trial batch of 6 ships, the SVDFN ordering 13, and the NRSF ordering 4.  While the USN opted to not continue with the program after the 6 initial ships, the NRSF agreed to a full partner role in 2320 and ordered an additional 10 hulls.

The first action the Valhalla saw was during Operation Bosporus, the 2317 US-led operation against PRC remnants along the Arma Frontier, seeing combat against PLAN forces in the Battle of Hyo’s Star and Strivedi’s Engagement.  While noted for their offensive strike ability, they were noted to be somewhat weak to Chinese cyber attacks, with both the USS Corvar (DDG-404) and USS Atrios (DDG-402) being temporarily disabled to a viral system attack, and the USS Gordan (DDG-405) being destroyed in a successful cyber attack against its #2 fusion reactor.  This led to the USN deciding to pursue a domestically produced destroyer, and leaving the program