Some of Grilses more modern gear was taken out and transferred to Rainbow, however Grilse had to remain operationally capable in accordance with the loan agreement and the transfer was limited. The sub returned to the US in September 1969. The boat was struck from the Naval Register on 19 July 1969. Grilse was officially paid off from Maritime Command on 2 October 1969 and returned to the US Navy the same day. Burrfish was sunk as a target off San Clemente Island, California, on 19 November 1969. Research Grilse was also used as a test platform for measuring the nature of turbulence, the results of which were analyzed by scientists that included French polymath Benoit Mandelbrot, whose thinking on fractals was substantially shaped by this experience: "On a visit to Vancouver, I asked to listen to the recordings. Not possible, I was told; the audio tapes, while playable, spanned too broad a frequency spectrum from high pitch to low, most of them outside human earshot. But surely, I said, you can speed up and slow down the tape? I insisted. And, after some fumbling with the then-primitive equipment, they obliged me. We sat and listened. Just listened. Loud high pitch, then low rumblings. Then high pitch again; more rumblings. Change the tape speed: Same pattern. Now, most people listening to this would call it stretches of high-frequency noise interrupted by low patches. But if they had taken the trouble to study the intervals, to analyze the relative proportions of high and low patches, they would have found something else: a turbulent process that proceeds in bursts and pauses, and whose parts scale fractally. The turbulent water through which the submarine’s nose plowed in a one-dimensional line was not one long alternation of fast and slow water. Instead, seen in all three dimensions, it was a complicated pattern of churning eddies and torrents, all interrelated from start of journey to end of journey—in effect, over an infinite span of time and space. "That experience underlies all my thinking about financial markets."Mandelbrot, Benoit. The Misbehavior of Markets: A Fractal View of Financial Turbulence (p. 227). Basic Books. Kindle Edition. – Benoit B. Mandelbrot, The (Mis)Behavior of Markets: A Fractal View of Financial Turbulence Awards Asiatic-Pacific Campaign Medal with five battle stars for World War II service References Citations Sources External links Kill Record: USS Burrfish Balao-class submarines Ships built in Kittery,