Art is by the artist of the cover of Jungle Jim (Dell, 1954 series) #9.
Pencils and inks credits for this sequence from Alberto Becattini (May 14, 2007). Milton Caniff only drew and inked Steve Canyon's heads in the story. Story continues on inside back cover in black and white and concludes on the back cover in color. Atomic bomb explosion depicted on inside back cover as part of story.
According to information in the foreword of "Milton Caniff's Steve Canyon: The Complete Series" (Hermes Press, 2011) #1, Milton Caniff inked the heads of the Steve Canyon character.