Guam is Unincorporated Territory of USA. Even though their passport is of USA, they have there own Government. They hold themselves as separate members of FIFA. Similar to Puerto Rico.
This link explains the difference between FIFA member and actually a country according to United Nations. United Kingdom is one country and participates in Olympics as UK (Great Britain and North Ireland) but in FIFA events, it gets broken into England, Scotland, Wales, North Ireland. Guam is a territory of USA . Separate nation in the eyes of FIFA but we need USA visa to go there.
They've only had 2 players in MLS so not yet. Only 1 still plays and he himself has a cap or two for the US. He also has a sad story with his son from last year which adds the drama... riveting!
Also, I am so happy Afghanistan lost to Syria 6-0... bloody cunts had an inflated ego, thinking they were better than SAFF. Just come back and prove it in India!
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Some clips of Guam football
http://www.quora.com/Which-countries-are-part-of-FIFA-but-not-of-the-United-Nations