With the 67th overall pick in the MLS SuperDraft, D.C. United picked up center back Liam Doyle. Doyle had been captain of the Ohio State Buckeyes, having transferred there from Cincinnati State for his final two years of eligibility. Listed as 6'4" and 198 lbs, Doyle would bring some size and strength to United's back four if he were to make it through the preseason and win himself a spot on the roster. Originally from the Isle of Man, Doyle would take up an international roster spot.
During his time with the Buckeyes, Doyle was known for his aerial ability (no surprise for someone of that size). However, he also got a reputation for being a threat as a free kick taker due to his shooting power. This past season, he also attempted 3 penalty kicks (converting twice). He finished the season as the Big Ten Defensive Player of the Year, and TopDrawerSoccer.com rated him as the #36 overall prospect in the draft pool. In his two seasons with Ohio State, Doyle started all 45 of the games he appeared in, scoring 7 goals and notching 8 assists. Again, this is a center back we're talking about.
Perhaps the most fascinating thing about Doyle: He has played for the Ellan Vannin team, a "national team" of sorts representing the Isle of Man but not actually supported by the Isle of Man FA. The Wikipedia entries for Ellan Vannin football team and the "official" Isle of Man football team explain the situation further.
United had two more picks - the 74th and 79th overall - but opted to pass. While this may seem like a wasted opportunity, MLS teams often pass in situations like this because they've already filled out their camp roster to their preferred size with USL or NASL players, international trialists, and others.