Almost from it's invention the cinema has played a role in war and morale. In the First World War the New Zealand Government even taxed expensive 'dress circle' theatre seats to raise money for the military. However, this slide was less direct, and comes from the Second World War.
It implores cinema goers (from the comfort of civilian life) to subscribe for the latest war bonds drive. By now most New Zealanders knew the war was going well and victory was near- but the slide reminded people of the energy needed for 'the final push'. The slide would have been shown alongside newsreels of New Zealand forces overseas and maybe was in the intermission of a patriotic film.
In fact, in early 1945 there was an undetected German U-Boat off the East Coast- the war was closer than many would have liked to admit.
Slides like this would have been shown in cinemas across New Zealand.