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Naval base upgrades are only unlocked by naval_bases_tech
The first three tiers of naval base are available from 1946 Renamed artificial_island Fortified Naval Base; Moved its name to anti_ship_missiles anti_ship_missiles_invention, long_range_fire_tactic and speedy_maneuvering_tactic unlocked by missile_guidance_system submarine_base unlocks in 1960
Added level three naval base tech to some countries