The Gato was the first "modern" "Fleet" boat in US Navy inventory and was built in large numbers (73 units) - making it's impact on the war effort greater than any other class. The first Gato - which was THE Gato - made its first war patrol in April '42.
Now, if you wait for a Balao you will have to start patrolling in July of '43 as that was the date of Balao's first patrol.
Note = there could have been some ships of each class that were actually commissioned and wen on partrol before the class name boats - but you get the general idea.
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