In Command Authority, When trying to find information on the KGBassassin known as Zenith. Ryan asks Greer if 'Rabbit' knows anything about the assassin with Greer confirming to Ryan that 'Rabbit' does not know anything about him.
Upon its release the novel received somewhat poor reviews. Critics praised Clancy's believable account of the plot, but disdained the lack of suspense. Reviewers for CNN and The New York Times considered the development of the main plot slow and tedious and noted that sub-plots remained underdeveloped and unresolved. Reviewers for Publishers Weekly and Esquire believed the involvement of Clancy's main character Ryan in the main plot to be highly marginal. Nevertheless, the novel reached #1 on the New York Times Best Seller List.