U.S. squad for upcoming World Cup qualifiers

Here's a link to an article that contains the U.S. National Team's squad for the upcoming World Cup qualifiers against Cuba and Trinidad and Tobago. The squad looks very similar to the recent one that was called up for the Guatemala game and I still would like to see some different players included. I don't really know what is accomplished by including Brian Ching, Eddie Lewis, and Frankie Hejduk.