Davis Commissioned as Second Lieutenant of the U.S. Army
As of the publication of Davis' appointment as second lieutenant of Dragoons on May 4, 1833, the "F." had disappeared from official documents as well.
At the time the initial was in use, there were no other Davis officers with the given name Jefferson (Jefferson C. Davis, a Union general in the Civil War, did not enlist until 1846), so it is unlikely the young cadet was trying to avoid mistaken identity. Only two other officers named Davis with the first initial "J." were in the army from 1824-1833, and one of them died in 1828. It should be noted that the "F." was used on Davis' first marriage license (June 17, 1835), although he signed the document without the "F." The initial was not used on his second marriage license ten years later.
Jefferson Davis - Google Books