In the last calendar year alone, Jürgen Klinsmann called in over 60 different players for roster spots, as he tinkered with his final 23 for the USMNT. Granted, we knew players like Clint Dempsey, Tim Howard, and Michael Bradley had unquestioned spots, but then again, so did Landon Donovan. Plenty of unknown youngsters — in the mold of John Anthony Brooks or Julian Green or DeAndre Yedlin — are affiliated with top clubs and academies in Europe and the Americas.