Art identification based on Stoner’s signed cover for Rocket Kelly #5 (October, 1946), which presents the rocket as being drawn consistent compared to how the rocket is drawn on this issue’s cover. Sue also appears to be drawn similarly on both covers, including how her long hair rolls up at the bottom, a hairstyle Stoner tended to draw female characters with.
Art ID from penciled note on online scanned version of this comic: http://comicbookplus.com/?dlid=20856
Last panel with solution to crime printed upside-down.
Initials "AZ" on page 2, last panel.