Answer:
Because he had lost his nose and had a surgery to be performed. He did not stand long enough in line to receive the medal.
Step-by-step explanation:
"In Another Country" is a short story written by Ernest Hemingway, first published in the collection of short stories "Men without Women" in 1927. The setting of the story is of World War 1, the narrator of the story visits hospital daily afternoon to get treatment of his injured knees.
There are other four soldiers also who have come to get their treatment done at the hospital. Three of them have received medals for their bravery in the war, but the boy whose face is covered with black handkerchief, did not received any medal because he got his nose injured in the battle in an hour of the battle and he did not stand long in the line to receive the medals, because fighting only for an hour does not qualify him to win the medal.
So, the answer is because he did not qualify to receive the medal as he got his nose injured within an hour of the battle.