Question: What number Secretary of the Air Force resigned as a result of Charles L. Bartlett's reporting?
Sentence (from "Charles L. Bartlett (journalist)"): Charles Leffingwell Bartlett (August 14, 1921 – February 17, 2017) won the 1956 Pulitzer Prize for National Reporting "for his original disclosures that led to the resignation of Harold E. Talbott as Secretary of the Air Force."
Relevant evidence: Yes