In the world of Starship Troopers, citizenship is earned through military service, and the propaganda-filled society promotes militarism and obedience to the state. The Mobile Infantry, the military unit in which Rico serves, is the primary fighting force against the Bug threat.
Rico's journey begins with his decision to enlist in the Mobile Infantry, inspired by his girlfriend Carmen, who joins the military's Starfleet. During his training, the brutality, and intensity of the program become apparent, with recruits facing physical and mental challenges and severe punishment for failure.
As the war with the Bugs intensifies, Rico and his unit are sent to the front lines, where they face overwhelming numbers and ferocious attacks from the alien creatures. In one particularly harrowing operation, Rico and his squad become trapped in a Bug hive and must fight their way out while facing devastating losses.
Despite the overwhelming odds, Rico perseveres, earning promotions and leadership roles within the Mobile Infantry. He also reconnects with Carmen, who joins him on a mission to capture a Brain Bug, a vital intelligence asset for the Bugs. The operation is successful, but not without cost, as Carmen is injured and Rico must make a difficult decision about her future in the military.
Throughout the film, the audience is shown the propaganda and societal pressures that promote the military's dominance. Rico himself wrestles with the morality of war and the value of human life. Ultimately, however, he remains committed to his duty and the fight against the Bugs, embodying the military ethos of sacrifice and honor.