these are the main upgrade path for ENC Classes

Regular Infantry: Warrior =>Swordmen => Iron Swordmen => Great Swordmen => Musketeer => Line Infantry => Rifflemen => Assault Infantry => All Terrain IFV

Light Ranged Infantry : Slingers => Shielded Slingers =>Crossbowmen => Arquebusiers => Musketeers => Line Infantry => Riflemen =>Assault Infantry => All Terrain IFV

Heavy Ranged Infantry: Archers =>Composite Bowmen => Recurve Bowmen => Musketeers => Line Infantry => Riflemen =>Assault Infantry => All Terrain IFV

Marines: Myridon => Marin => Sea Troops => Company Marine => Sea Battaleon => Marine => APC

Skirmishers: Scouts / Spear Throwers => Skirmishers => Marksman => Privateer => Rangers => Partisans => Commandos => Special Forces => Augmented Infantry

Escort Naval: Harpax War Galley => Cog => Carrack => Sail Frigate => Steam Frigate => Torpedo Boat Destroyer => Destroyer => Guided Missile Destroyer => Stealth Missile Cruiser

Light Naval: Lembos=> Galliot=> Privateer => Steam Corvette => Steam Torpedo Boat => Motor Torpedo Boat => Missile Boat => Stealth Corvette

Bombard Naval: Bomb Ketch => Steam Gunboat => Protected Cruiser => Light Cruiser => Missile Cruiser=>Stealth Cruiser

Heavy Naval: Pentek => Quadrireme => Galleass =>Galleon => Man O'War => Ir0nclad => Dreadnought => Battleship => Guided Missile Cruiser => Stealth Missile Cruiser

Heavy Cavalry: Chairot => Cataphracts => Knight => Lancers => Cuirassiers =>
Mounted Infantry => Infantry Tank => Medium Tank => Main Battle Tank => Stealth Tank

Light Cavalry: Horse Scout => Horsemen => Stradiot => Light Cavalry => Chasseurs =>Carbin Cavalry => Tankette => Light Tank => Anti Tank IFV

Ranged Cavalry: Chariot Archers => Horse Archers => Mounted Crossbowmen => Reiters => Dragoon => Carbine Cavalry => Armored Scout => Armored Recon => Attack Helicopter => Helicopter Gunship => Stealth Helicopter

Anti Cavalry: Stone Spearman => Spearmen => Phalanx => Pikemen => Halberdiers => Musketeers => Line Infantry =>Riffleman => Assault Infantry => All Terrain IFV

[]Infantry Suppression:[/b] Organ Gun => Gattling Gun =>Machine Gun => Anti Aircraft Gun => Air Defence

Direct Fire Artillery: Ballista => Sapper => Cannon => Field Gun => Breachloaded Cannon =>Anti Tank Gun => TOW Squad => Antitank Squad

Indirect Fire Artillery Staff Slinger => Mortar => Field Howitzer => Siege Artillery => Towed Artillery => Towed Gun Howitzer => Selfpropelled Howitzer

Small Stealth Naval: Hellraiser => Hand Crancked Submarine => Steam Submarine => Fleet Submarine => Diesel Submarine => Fuel Cell Submarine

Large Stealth Naval: Cruiser Submarine => Nuclear Attack Submarine => Nuclear Missile Submarine

Naval Transport: Ancient Transport Galley => Transport Galley => Cog => Caravel => Barque => Steam Transport => Landing Craft => Hovercraft

Air Fighter: Biplane => Monoplane Fighter => Jet Fighter => Interceptor => Stealth Fighter

Air Multirole: Torpedo Bomber => Multirole Combat Aircraft => Multirole Jet Fighter => Stealth Fighter

Bombers: Zeppelin => Heavy Bomber => Jet Bomber => Stealth Bomber
Fast Bomber: Supersonic Bomber => Hypersonic Bomber