No Balao class submarine?

[Hitman]

The Tang I do Belive was a Balao.

That's right SS-306 was already a BALAO

The Balaos were essentially improved hull-Gatos, same design, but improved hull resistance AND what was almost as important, prepared to be assembled from pre-built parts (like teh german Type XXI or the Victory/Liberty ships)

As for the conning tower, ALL US subs where it was possible received that refit during 1943, intended to have a smaller visual silhouette for night surface actions. Perchs, tambors and also salmos & sargos received that refit plus the first SJ radar and also a new repaint in grey later (At the start of the war and during the first months, US subs were all painted in very dark grey, nearly black).