The Mark 26 nuclear bomb was related to the Mark 21. Development of the Mk-26 started on September 1, 1954. At the end of July 1955, the design of the Mk-21 was released for production, while the design for the Mk-26 was not. The "Clean" Mk-21C which was tested in the Redwing Navajo shot did not interest the US Air Force, or AEC. As the decision not to pursue the "clean" Mk-21 closely coincided with the decision to terminate development of the Mk-26 in April 1957, it is possible that Mk-26 was the designation for the clean version of the Mk-21.

References

• Hansen, Chuck, "Swords of Armageddon: U.S. Nuclear Weapons Development since 1945" (CD-ROM & download available). PDF-2.67 Mb. 2,600 pages, Sunnyvale, California, Chucklea Publications, 1995, 2007. ISBN 978-0-9791915-0-3 (2nd Ed.)

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