New classes!
Land:
Paratrooper (airdrops)
Everything below this line you don't have to use custom units for. Also, for the sea units, you can use spacecraft.
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Land:
Anit-Air (defends against air units.)
Sea:
Scout Ship (meant for exploration.)
Cruiser (fastest, weakest, weakest bombardment, largest rate of fire)
Battleship (all-around)
Warship (slowest, strongest, strongest bombardment, lowest rate of fire)
Submarine (Invisible, detects invisible, stealth attack)
Precision Warship (an upgrade for the Warship, stronger bombardment, larger rate of fire, and stealth attack)
Privateer (hidden nationality, enslaves)
Raider Ship (Invisible, hidden nationality, stealth attack.)
Carrier (Carries aircraft)
Sea Transport (Transports foot units across the ocean.)
Air:
Fighter (strong defense, weak bombing)
Bomber (weak defense, strong bombing)
Air Transport (can airdrop, holds units)
Stealth Fighter (upgrade to fighter, has stealth attack)
Stealth Bomber (upgrade to bomber, has stealth attack)