"V Is The Sign"
Major Thorpe (writer and artist), Mort Leav (pencils and inks)
Published in Jumbo Comics #42, Aug 1942 - 8 pages
Working for the newly created but not formally organized United Nations, ZX-5 is given a Nazi uniform and flown to Berlin where he is to find a heavy-set Agent 847 and find a way to get him back.
Good line: A British soldier waves to ZX-5 as he flies off to Berlin with the shout, "Heel Hitler".
Fair line: In Berlin ZX-5 is spotted as a spy and accosted by soldiers, one of whom vows, "We will blitz you to pieces".
Here are the pages I have of it.