The U.S. Women’s Soccer team wasn’t feelin very patriotic during their World Cup opener — and it showed on their faces … with mostly closed mouths during the National Anthem.

The U.S.’s debut game against Vietnam went down Friday in New Zealand, and a lot of people couldn’t help but notice that most of the American players were choosing not to sing along to “The Star-Spangled Banner” while the famed music played before kickoff.

It was awkward — the camera pans across the entire row … and just about everyone, except for a few stray players, had their mouths shut. Some even had their arms behind their back.

The starters who opted to skip the Nat’l Anthem included … Alex Morgan, Andi Sullivan, Sophia Smith, Naomi Girma, Emily Fox, Trinity Rodman and Crystal Dunn, among others. A couple were notably mouthing the words … Alyssa Naeher and Lindsey Horan.

To make matters worse … the Vietnamese players were pretty much all singing their national anthem, loudly/proudly it seems — with hands over hearts. Ditto for just about every other international team we can see — FOX is cutting all the national anthems on their social page.

On its face, it looks like every other country — besides the U.S. — is belting out their tunes.

It remains to be seen if the U.S. is going to do this every time they play another team — the National Anthem will, in fact, be blared before each of their matches … and since it seems like they’re making a statement — it has, no doubt, pissed off some along political lines.