Designation Systems
Under the designation system established in April 1947 the first N-class airships were given the Navy designation of ZPN-1, (Z = lighter-than-air; P = patrol; N = type/class). In April 1954, the designation system was changed to mimic that used for heavier-than-air aircraft. With this change the designation for the ZPN-1 became the ZPG-1 (Z = lighter-than-air; P = patrol; G=Goodyear; 1=first version). In the 1962 system the ZPG-1 designation was changed to SZ-1A (S=anti-submarine warfare; Z=lighter-than-air type; 1=first vehicle in the type; A=first model in the series). The designations for later model blimps followed similarly.
Read more about this topic: N Class Blimp
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