 The long-range 12-inch batteries were retained and casemated, with a few built new.Due to circumstances requiring development of a new 16-inch gun for new battleships, the Navy released about 50 additional 1920s 16-inch guns.The 16-inch batteries would be complemented by guns on new high-angle shielded barbette mounts with magazine bunkers, and new 90 mm (3.5-inch) dual-purpose gun batteries.