USS Harder (SS-568) with three shark-fin arrays, known as Puffs, passive fire-control system, BQG-4, circa 1968. USN photo courtesy of ssn583.com., text courtesy of John Hummel.
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{{Information |Description=Harder (SS-568) with three shark-fin arrays, known as Puffs, passive fire-control system, BQG-4, circa 1968. USN photo courtesy of ssn583.com., text courtesy of John Hummel. |Source=http://www.navsource.org/archives/08/0856807.j
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move approved by: User:Common Good This image was moved from Image:568.jpg {{Information |Description=USS Harder (SS-568) with three shark-fin arrays, known as Puffs, passive fire-control system, BQG-4, circa 1968. USN photo courtesy of ssn583.c