"Uncle Sam's Boys as Lieutenants; or, Serving Old Glory as Line Officers" is a military adventure novel written by H. Irving Hancock. The book belongs to the "Uncle Sam's Boys" series, which follows the adventures of a group of young men as they serve in various branches of the United States military.In this particular installment, the focus is on the experiences of the young protagonists as they take on the responsibilities of lieutenants in the military. As line officers, they are tasked with leading soldiers in combat and managing various aspects of military operations.The novel likely explores themes such as leadership, courage, camaraderie, and patriotism as the protagonists navigate the challenges and dangers of military service. They may face adversaries both on and off the battlefield, requiring them to demonstrate their skills and character in order to succeed.