In late May 1827, Poe lied about his age and identity to enlist in Company H, 1st Artillery in Boston. He was promoted to Sgt Major in January 1829, and released 2 years into a 5 year enlistment in April 1829 to work towards acceptance to West Point which he would enter in 1830. Then Spring 1831 would see him dismissed and his military career over for good.
I wonder if Poe stuck out like a bleeding wound as an enlisted soldier, because he was native-born American from a wealthy family? Poe had a family legacy because his grandfather had been a quartermaster in the Continentals.
Given the inherent suspicion of the American polity toward armies and soldiers, it was rare for wealthy young men to join the army in peacetime. Most new recruits were immigrants and didn't speak English fluently. Desertion and bad discipline were rampant. In a year of Poe's enlistment, the Army not only experienced mutiny at West Point, but had a soldier murder another, and an attempt to murder an officer in a short lived Christmas Mutiny at Fort Mackinac, Michigan.
I read r/askhistorian User "PartyMoses"'s comment.