40. List of airships of the United States Navy
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(ZR-1) Shenandoah - 1923-25 (crashed)
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(ZR-2) R38 - 1921 (crashed)
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(ZR-3) Los Angeles - 1924-39
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ZMC-2, a metalclad-airship built by the
Aircraft Development Corp - 1929-41
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(ZRS-4) Akron - 1931-33 (crashed)
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(ZRS-5) Macon - 1933-35 (crashed)