The hospital corpsman emblem. Corpsmen are the Navy and Marine Corps' enlisted medical specialists. Battlefield corpsmen are largely responsible for the decreased number of casualties dying from combat wounds in the Long War, a ratio lower than that of recent 20th-century wars, including Operation Desert Storm. - The hospital corpsman emblem. Corpsmen are the Navy and Marine Corps' enlisted medical specialists. Battlefield corpsmen are largely responsible for the decreased number of casualties dying from combat wounds in the Long War, a ratio lower than that of recent 20th-century wars, including Operation Desert Storm.