ДЗ Перевод бойцов

using System;
using System.Collections.Generic;
using System.Linq;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            PersonBase personBase = new PersonBase();
            personBase.ShowSoldiersInfo();
        }
    }

    class PersonBase
    {
        private List<Person> _firstArmy;
        private List<Person> _secondArmy;

        public PersonBase()
        {
            _firstArmy = GenerateSoldiers();
            _secondArmy = GenerateSoldiers();
        }

        public void ShowSoldiersInfo()
        {
            ConsoleColor firstArmyColor = ConsoleColor.Red;
            ConsoleColor secondArmyColor = ConsoleColor.Blue;
            ConsoleColor filteredArmyColor = ConsoleColor.White;


            Console.ForegroundColor = firstArmyColor;
            Console.WriteLine("Все солдаты первой армии");

            ShowList(_firstArmy);

            Console.ForegroundColor = secondArmyColor;
            Console.WriteLine("Все солдаты второй армии");

            ShowList(_secondArmy);

            Console.ForegroundColor = filteredArmyColor;
            ChangeArmies();

            Console.ForegroundColor = firstArmyColor;
            Console.WriteLine("Первая измененная армия");

            ShowList(_firstArmy);

            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine("Объединенная армия");

            ShowList(_secondArmy);

            Console.ReadKey();
        }

        private void ChangeArmies()
        {
            string surnameCharForFilter = "Б";
            var filteredList = FilterSoldiersByChar(surnameCharForFilter);

            Console.WriteLine("Отфильтрованные солдаты");
            ShowList(filteredList);

            _firstArmy = _firstArmy.Except(filteredList).ToList();

            var unitedList = _secondArmy.Union(filteredList);
            _secondArmy = unitedList.ToList();
        }

        private IEnumerable<Person> FilterSoldiersByChar(string firstChar)
        {
            var filteredList = _firstArmy.Where(soldier => soldier.Surname.StartsWith(firstChar));

            return filteredList;
        }

        private void ShowList(IEnumerable<Person> list)
        {
            foreach (Person person in list)
            {
                Console.WriteLine($"{person.Name} - {person.Surname}");
            }
        }

        private List<Person> GenerateSoldiers()
        {
            PersonCreator creator = new PersonCreator();
            int dataBaseCapacity = 20;

            List<Person> army = new List<Person>();

            for (int i = 0; i < dataBaseCapacity; i++)
            {
                army.Add(creator.CreatePerson());
            }

            return army;
        }
    }


    class PersonCreator
    {
        private List<string> _names;
        private List<string> _surnames;
        private List<string> _weapons;
        private List<string> _ranks;

        public PersonCreator()
        {
            InitSurnames();
            InitNames();
            InitRanks();
            InitWeapons();
        }

        public Person CreatePerson()
        {
            int maxTerm = 50;

            string name = GetRandomValue(_names);
            string surname = GetRandomValue(_surnames);
            string weapon = GetRandomValue(_weapons);
            string rank = GetRandomValue(_ranks);
            int term = UserUtils.GenerateRandomValue(maxTerm);

            return new Person(name, surname, weapon, rank, term);
        }

        private void InitSurnames()
        {
            _surnames = new List<string>();
            _surnames.Add("Смирнов");
            _surnames.Add("Иванов");
            _surnames.Add("Кузнецов");
            _surnames.Add("Бабаев");
            _surnames.Add("Соколов");
            _surnames.Add("Лебедев");
            _surnames.Add("Баранов");
            _surnames.Add("Бобрыкин");
            _surnames.Add("Морозов");
            _surnames.Add("Козлов");
            _surnames.Add("Волков");
        }

        private void InitRanks()
        {
            _ranks = new List<string>();
            _ranks.Add("Новобранец");
            _ranks.Add("Рядовой");
            _ranks.Add("Сержант");
            _ranks.Add("Генерал");
        }

        private void InitNames()
        {
            _names = new List<string>();
            _names.Add("Максим");
            _names.Add("Михаил");
            _names.Add("Александр");
            _names.Add("Дмитрий");
            _names.Add("Денис");
            _names.Add("Илья");
            _names.Add("Андрей");
            _names.Add("Артем");
            _names.Add("Иван");
            _names.Add("Алексей");
            _names.Add("Никита");
        }

        private void InitWeapons()
        {
            _weapons = new List<string>();
            _weapons.Add("Пистолет");
            _weapons.Add("Автомат");
            _weapons.Add("Пулемет");
            _weapons.Add("Гранатомет");
        }

        private string GetRandomValue(List<string> values)
        {
            int randomId = UserUtils.GenerateRandomValue(values.Count);
            return values[randomId];
        }
    }

    class Person
    {
        public Person(string name, string surname, string weapon, string rank, int term)
        {
            Name = name;
            Surname = surname;
            Weapon = weapon;
            Rank = rank;
            Term = term;
        }

        public string Name { get; private set; }

        public string Surname { get; private set; }

        public string Weapon { get; private set; }

        public string Rank { get; private set; }

        public int Term { get; private set; }
    }

    static class UserUtils
    {
        private static Random s_random = new Random();

        public static int GenerateRandomValue(int maxValue)
        {
            return s_random.Next(maxValue);
        }

        public static int GenerateRandomValue(int minValue, int maxValue)
        {
            return s_random.Next(minValue, maxValue);
        }

        public static double GenerateRandomDouble()
        {
            return s_random.NextDouble();
        }
    }
}