Blue Devils Elite Combat Unit Whose Members Were Mostly What

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Beginning as a humble goblin village, Tempest expanded rapidly with more and more allies joining the nation, while facing increasingly powerful enemies. As of Volume 12, Tempest has already amassed a formidable military force in preparation against the Eastern Empire's invasion.

Principles

Tempest's military can be thought of as a self-defense force instead of offensive forces. This reflected by how Rimuru decided to wait for the Eastern Empire to attack instead of actively waging offensive war. They believe it to be morally right to decimate any invading forces down to the last men, but they would never kill any civilian or continue killing after the war is declared over.

Total Forces (As of Volume 12)

Tempest's Standing Military

Gobta's First Corps

Approximately 12,100 members.

Goblin Riders, 100 members. Evolved from the combination of Hobgoblins and Star Wolves. Each individuals are ranked A- and they will serve as captains of this corps.
Green Numbers, 12,000 members. They have been split into a host of 4,000 members, comprising three teams. The majority of them are warriors from the many tribes of the Jura Forest. Even so, they are B Rank and are a splendid fighting force.

Geld's Second Corps

Approximately 37,000 members.

Yellow Numbers, 2,000 members. These are the elite High Orcs serving under Geld in the beginning. Individually they are of B+ rank. They are also able to unite with Geld to become a single shield. Rimuru reorganized them into teams and assigned captains.
Orange Numbers, 35,000 members, made of the recently "born" High Orcs and are C-ranked. However, only 15,000 are combat units while 20,000 act as support and Engineer Corps.

Gabiru's Third Corps

Approximately 3,100 members.

Hiryuu, 100 members. They are Dragonewts that followed Gabiru to Tempest in earlier days. Each individuals are mostly ranked A-, but they could coordinate their attacks extremely well. There are some among them who are surpassing A rank as well. Their trump card is the "Dragon Body" Transformation.
Blue Numbers, 3,000 members. Comprised solely of new applicants from the lizardmen. They are only C-ranked but they mount the Wyverns and dominate the airspace. Wyverns are B+ level lesser dragon species acquired with the help of Milim.

Benimaru's Fourth Corps

Approximately 30,000 members.

Kurenai, 300 members. A group of A- rank ogre led by Gobua that acts as Benimaru's personal cohort. Their current "level" would match the Crusaders.
Red numbers, approximately 30,000 majins, mostly former subordinates of Clayman. They are mostly of B rank, with a few individuals in the A rank territory. They volunteered to protect Tempest after being treated well as POWs.

Souei's Shadow Squad

Approximately 100 members.

This unit specializes in intelligence, espionage, and assassination. Souei has sole and exclusive control over them, and few even know of them. Most known members are Dragonewt.

Shion's Personal Army

Approximately 10,000 members.

Yomigaeri, 100 members. This unit of consists of individuals killed during the invasion of the Kingdom of Falmuth and revived by Rimuru, obtaining Extra Skill "Complete Memory" and became nigh-immortal. They have reached B+ Rank and are trained personally by Shion.
Shion's fan club, approximately 10,000 members. They are lead by Captain Dagura, Debura, and Ryura. (Rimuru incorrectly believes their numbers to be less than 1000, so his estimate on total troops is 10,000 too low).

Diablo's Black Numbers

They are 711 Demons ranked A and above, consisting of 4 Primordial demons, their subordinates, and unique individuals. After being summoned, these demons are made to inhabit/possess the homunculi inside capsules developed by Tempest. Although their number are too few to call themselves as a Corps, Rimuru considers them as Tempest's strongest unit.

Masayuki's Volunteer Corps

A group of approximately 20,000 humans residing in Tempest and nearby countries， volunteered to protect Tempest. They consist of adventurers, mercenaries and immigrants. Rimuru placed Masayuki in charge of this unit due to his unique skill, and the fact that appointing a monster to command a unit formed by humans could stir unnecessary discontent.

Ramiris' Labyrinth

During war time, the labyrinth becomes a fortress of sorts. Rimuru City itself can be moved to the lowest floor and the monsters in the labyrinth will act as defensive forces.

Ten Lords of the Labyrinth

The strongest individuals in the Labyrinth with combat power of Executives.

Guardian of the 99th floor, Inferno Dragon Lord
Guardian of the 98th floor, Frost Dragon Lord
Guardian of the 97th floor, Thunder Dragon Lord
Guardian of the 96th floor, Tremor Dragon Lord
Guardian of the 90th floor, Nine Head Beast Kumara
Guardian of the 80th floor, Insect Kaiser Zegion
Floor Boss of the 79th floor, Insect Queen Apito
Guardian of the 70th floor, Immortal King Adalman
Vanguard of the 70th floor, Death Paladin Albert
Guardian of the 60th floor, Gadra with the Demon Lord Protector Colossus

Others

Dungeon Dominators
Treyni and other Dryads
Charys
Beretta
Veldora Tempest
Adalman's Death Dragon
Guardians of the 50th floor, Gozurl and Mezurl
Various monsters and other Floor Guardians

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Source: https://tensura.fandom.com/wiki/Tempest_Military_Strength