Grant graduated on June 30, 1843, ranked 21st out of 39 in his class and was promoted the next day to the rank brevet second lieutenant. Small for his age at 17, he had entered the academy weighing only at tall; upon graduation four years later he had grown to a height of . Grant planned to resign his commission after his four-year term of duty. He would later write to a friend that among the happiest days of his life were the day he left the presidency and the day he left the academy. Despite his excellent horsemanship, he was not assigned to the cavalry, but to the 4th Infantry Regiment. Grant's first assignment took him to the Jefferson Barracks near St. Louis, Missouri. Lt. Col. Robert C. Buchanan fined Grant wine bottles for Grant's late returns from White Haven. Commanded by Colonel Stephen W. Kearny, the barracks was the nation's largest military base in the West. Grant was happy with his new commander but looked forward to the end of his military service and a possible teaching career.