fist off the Earth is made up of a few  factions them being

UNCF Cosmo Navy also known as the EDF aka Earth Defens force

they are the main part of the navy

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the UNSC

they are apart of the main army and navy

they are home to the spartan and ODST program and MAC cannons and railguns

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international rescue ( witch was shut down as international rescue was ran by kieron and his team)

International Rescue use to be a secret, organisation before showing them selfs to the world in 2020 and now known tot he world but they are still the same as they were before a rescie group as they are a non-profit organisation dedicated to saving lives. Any who find themselves in danger, anywhere in the world, need only put out a call for help - on any frequency - and, from...somewhere...I.R. will hear it, and respond

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the last is the Autobots

Fleet

Kongo-class space battleship

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Isokaze-class assault space destroyer

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Murasame-class space cruiser 

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 Main Battleship Dreadnought

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Vanguard armament spaceship aka andromeda class Battleship

Vanguard armament spaceship Spacecraft carrier aka andromeda class Carrier

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Modified Dreadnought-class Combat Carrier

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Modified Dreadnought-class Supply Carrier ( same as the Modified Dreadnought-class Combat Carrier it just paint diffrent and the WMG is not there)

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UNSC Paris Class Heavy Frigate

UNSC Stalwart-class light frigate

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UNSC Halcyon Pillar of Autumn HR

UNSC Strident-class heavy frigate

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John A. Warden

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Corvette Transport

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Fast Attack Ship