USS Batfish (SSN-681) and USS Olympia (SSN-717) were the two test platforms in the middle 80's. The boats were not built in hull number order.
If I remember correctly, somewhere in flight 2 is when the tiles were added in new construction. All other boats (637's included) were backfitted.
There were two main flights of 637's (not including the three specials) and FOUR distinct flights of 688. (Wikipedia is incorrect)
Flight 1 - 688-699 (upgraded to flight 2 specs at first DMP)
Flight 2 - 700-718
Flight 3 - 719-750 (First VLS)
Flight 4 - 751-773 (also called 688I)
Served on SSN-700, SSN-670 and SSN-723
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