Thanks, Zioneer. Another question- what is it with Mormons and middle initials?
L.D. Smith answered that, but specifically for leaders, we've had a lot of apostles with similar or the same names, so we use initials to tell them apart. For example, our first prophet was named Joseph Smith (whose own father was also named Joseph Smith), who is identified various as simply Joseph Smith, The Prophet, Joseph Smith Junior, or Brother Joseph (in contemporary accounts). Joseph Smith had a son named Joseph Smith (who became leader of the Reorganized LDS, now known as the Community of Christ), and a nephew who was also named Joseph Smith, who became sixth prophet-president of the Church.
The first Joseph's son was known as Joseph Smith III, while his nephew had the middle name of Fielding, so was known as Joseph F. Smith. Joseph F. Smith also had a son named Joseph Fielding Smith, who became tenth prophet-president, and thus had his full name used to not confuse him with the other two. Even more confusing, the eighth prophet was George Albert Smith, who was himself son of an apostle with the same name (served as an apostle at the same time, in fact), and was cousin to all of the Josephs. We've had a lot of Smiths, basically.
Similarly, the twelfth prophet was Ezra Taft Benson, who was great-grandson of an apostle of the same name.
So we've needed the middle initials to differentiate all of these related prophets and apostles, and now that we've started, we just naturally do it for even apostles unrelated to any of the other apostles (like Uchtdorf, who is completely unrelated to all of the rest).