All Virginia Class boats have four torpedo tubes and 12 Vertical Launch System (VLS) tubes.
From SSN-784 and above the 12 individual VLS tubes have been replaced by two SSGN style tube with 12 weapon slots.
SSN-21 boats (Seawolf etc) have eight torpedo tubes and no VLS.
As stated in several non-classified articles released by the US Navy, the three large panels on each side of the boat are the WAA (Wide Aperture Array). Part of the Sonar System.
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