Don't Cry, It's Only Thunder (1982)

During the Vietnam War, Brian Anderson (Dennis Christopher), a young Army medic, is stationed in Saigon. Initially apathetic and self-serving, he eventually has his heart won over by the children at a nearby orphanage where he does volunteer work. At first, a doctor named Katherine Cross (Susan Saint James) has to persuade him to help the children. But soon, Brian willingly puts his career and safety on the line to provide the orphans with the food and medical supplies they need.