Wish I still had mine, Kill a Commie for Christ, Zap a Zip for Jesus.
Popular in my time.
I kinda figured what Zip meant, but had to look up to be sure:
https://books.google.com/books?id=HRsWBAAAQBAJ&pg=PA167&lpg=PA167&dq=zip+slang+vietnam&source=bl&ots=sTzuONJ7jt&sig=RUvQP4qsc-7laRHU88G7tvE0uwQ&hl=en&sa=X&ved=0ahUKEwintqSi4pPLAhVDyWMKHaX3AQAQ6AEIMDAD#v=onepage&q=zip%20slang%20vietnam&f=false