Starship Troopers

At first, Johnnie despises Sergeant Zim. What is it about Zim that Johnnie hates, and what makes Johnnie change his mind and come to admire him? 

Heinlein likens Bug society to an international movement prominent in 1959, the year Starship Troopers is published. Which movement is this, and why does he make the comparison? Offer two examples by which the Bugs and the movement are similar.

Full citizenship in the Terran Federation is offered only to those who volunteer for a term in Federal Service and then retire to civilian life. Argue for or against this system, including three reasons for your conclusion.