Uuno is forced to complete his mandatory military service when it is revealed that he only spent one day in the army in his youth. As is typical of the Turhapuro series his family and friends become closely tied in with these events. His friends Härski Hartikainen and Sörsselssön return to the army for a refresher course and by chance Uuno's father-in-law, Councillor Tuura is made the Finnish Defence Minister. In one of the most memorable scenes, Uuno's wife, Elisabeth, dresses as Uuno and substitutes him for a day as Uuno has an apparently urgent meeting (at a restaurant) and while becoming lost in the woods with a malfunctioning radio, Tuura accidentally declares war on Sweden.
Drug dealer Aki is taken to hospital after a violent attack where he loses his merchandise and money. One of the paramedics, old Eino, befriends Aki later in the hospital and offers him a summer job after hearing that he has training in first aid. Eino even offers Aki a place to stay next to his ambulance garage. This provides Aki a perfect hiding place from his former employers who are after him. At the garage, Aki learns about life and the art of archery from peaceful Eino, and falls in love with Eino's daughter Lena who works at the ambulance switchboard. But no hiding place is good enough to last forever.
A story about the rise of awareness among the youth against the pollution and eco-system disaster. The conflict between the youth and ruling establishment is also taken under the inspection. The daughter of the prime minister and her relation to the son of another minister of opposing party is especially under surveillance.