Aldo Raine brands certain surviving Nazis to prevent them from hiding their allegiance when they take off their uniforms. The motif appears before the climax and returns when Landa tries to negotiate a new identity.
The uniform can come off; the mark remains
The logic Aldo lays out begins with an identification problem. A soldier can leave off his uniform and later present himself as someone unconnected to the regime's actions. The mark on the forehead is meant to prevent that disappearance of signs. The film turns the body into a visible record that the bearer cannot remove like a garment.
The chosen symbol is the swastika because it identifies the affiliation Aldo wants to make impossible to deny. Within the scene it functions as both punishment and an imposed label. It is not the Basterds admiringly adopting the emblem. The violence of the act lies precisely in forcing the target to keep the sign of an identity he might try to hide.
The motif's first use prepares for its return. The film explains the logic before applying it to Landa, so the viewer can anticipate the connection between survival and the mark. The device does not come across as a final idea independent of Aldo's earlier behavior. It is part of the doctrine with which the character manages his prisoners.
The presentation of Aldo Raine combines that internal consistency with a brutality the film does not conceal. The character may justify his act within his own logic, but that justification does not automatically make it a judicial procedure. We are looking at a mutilation imposed by someone who has physical power over another person.
Witnesses who cannot tell just any story
The mark also intervenes in the circulation of stories. A survivor can explain what happened, but he carries a sign that limits how he will present himself to others. Aldo uses the body to accompany words. The Basterds' reputation spreads through people who have experienced their violence and retain visible evidence of it.
The film thus links memory and public exposure. The forehead is a part of the body that is normally visible during an interaction. The dramatic choice is meant to make the imposed identity appear before any explanation. The marked character loses the ability to decide when and how to bring that past into a conversation.
That symbolic effectiveness does not amount to a real guarantee of truth. A bodily sign can communicate an accusation, but it cannot replace full knowledge of a person's actions. The film concentrates the conflict in characters whose Nazi allegiance we know within the story. It does not offer a general historical method of identification that can be transferred outside that fiction.
Nor is it necessary to interpret the mark as the only form of memory present in the film. Shosanna maintains a different relationship to the past: her experience and her recorded image produce a different response. Aldo fixes a sign on an enemy's body; she prepares a self-representation. Both devices take part in the struggle to control what will be remembered, from different positions and through different methods.
Landa wants to switch sides and rewrite his story
In the ending, Landa negotiates his cooperation with the Allies to gain advantages and present himself as responsible for the victory. His plan requires the final events to take the place of his earlier trajectory. The film does not show a repentance that would explain this decision as moral repair. Landa calculates an exit and seeks to manage the story the victors will tell about him.
Aldo agrees to take him to the handoff point, but he does not allow the deal to fully determine what happens between them. The mark contradicts the officer's desire to shed the regime's visible signs. Landa's verbal intelligence, so effective in other settings, does not give him control over that decision. The encounter ends with a power relation that can no longer be negotiated in the same way.
The ending of Inglourious Basterds thus returns to an idea introduced in the second chapter. The repetition allows the viewer to recognize the meaning without an extended explanation. Landa does not simply receive another wound: he receives the kind of mark Aldo had reserved for those who tried to survive without visibly carrying their Nazi identity.
Aldo's reaction to the result introduces dark humor and a possible self-referential reading. The film puts us in front of a work that its executor considers satisfying. That choice is uncomfortable because it links aesthetic judgment and bodily harm. The shot may produce a sense of vengeful closure, but it also forces us to observe the pleasure with which the punishment is presented.
The permanence promised by the symbol belongs to the logic of the story, not to a medical explanation of a specific scar. Its force lies in making visible the impossibility of a clean escape for Landa. The officer who had controlled names, identities, and conversations ends up becoming the recipient of an inscription that another person has decided for him.
More context in the Inglourious Basterds guide.