PHILADELPHIA — Mark McKenzie was talking Thursday about the little intricacies, the things an athlete knows about his teammates through practicing together over and over and over again.

“Whether it’s turning over your left shoulder, turning over your right shoulder, whether someone’s a bit more aggressive stepping into midfield,” McKenzie, a center back for the USMNT, said before Thursday’s training session. “Whether they’re more comfortable in aerial duels, whether they’re more comfortable covering space behind. I think those are all things you build through repetition.”

And that inherently represents a problem to be solved for a national team.

Between now and June 12, when it begins the World Cup on home soil in Los Angeles, the Yanks have all of a handful of training sessions togethe

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