It's time for Jonsson to return to his old regiment to rehearse what he learned during conscription a few years ago. He meets his old friends, platoon leader Larsson and the music loving captain 'Beethoven'. Jonsson and his comrades doesn't take it very serious - but they have a jolly good time. A female journalist follows the exercise to write an article, and gets interested in him.
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Jonsson is called back for refresher training. He meets Lövgren, Larsson and others who aren't very serious but instead, see it as an opportunity to have fun for a month away from work.