sentences:  The sides of the forward conning tower were thick and the roof was 50 mm thick, while the aft conning tower received significantly less protection, with 150 mm thick sides and a roof.The ships' peacetime careers consisted of routine fleet training.Squadron and fleet training typically took place in April and May, a major fleet cruise generally followed in June and July, after which the fleet assembled for the annual fleet maneuvers in late August and September.