The USA may also build strategic bombers. These are more effective than in Europe, as Japanese cities were built from wood, but will not be usable until the final turns of the game - although permissible bombing range increases throughout the game, in practice the USA needs to occupy the Marianas and then Okinawa, or bomb Japan from China if a sea supply route can be traced. In the final turns US strategic bombers may drop two Atomic Bombs, which besides exterminating any Japanese units in the target hex also increase the chances of Japanese surrender (see below).