Final answer:
The excerpt needed to directly address the soldiers' skepticism towards rehabilitation machines is not included in the provided text, but Hemingway's characters often reflect disillusionment that could extend to skepticism of such recovery efforts.
Step-by-step explanation:
The sentence that reflects the skepticism the soldiers have for the rehabilitation machines does not seem to be present in the provided excerpts from "In Another Country" by Ernest Hemingway. However, in the context of Hemingway's work, such skepticism often arises from the disillusionment with war and the questioning of the supposed heroism and recovery efforts post-war. Hemingway's characters frequently express cynicism about their surroundings and their futures, encapsulated within the broken promises of technology, heroism, and society's capability to rehabilitate and reconstruct identities after the devastation of war.
The distrust in the rehabilitation machines and other measures can be viewed as a metaphor for the broader disillusionment with the mechanisms and promises of society and culture that failed to deliver in the face of the trauma experienced by soldiers during World War I. The theme of disillusionment is heavily evident in Hemingway's literature, which resonates with the loss of faith in traditional values and beliefs after the war.