"Guard" was one of Cozzens' "professional novels", in which he drew detailed portraits of individuals, centering on their professional lives and the details of their work. He expertly recreates the feel of the stateside Army Air Forces, accurately recalls historical facts pertinent to the story line without becoming academic, and references airplanes and technical aspects without excessive explanation and without bogging down the action. All characters in the novel, except Nathaniel Hicks, are named throughout using their rank or title and last name.