First, Palmieri will head to Nationwide Arena in Columbus for Team USA training camp, which opens Sept. 5. It's a place he didn't think he'd be going after he wasn't among the final seven players named to the roster May 27.
But Callahan's injury opened a spot, and Palmieri was named added to Team USA on July 20.
"After they announced [the roster] and I didn't make it, not that I forgot about it, but I kind of put it aside and set my focus on training camp," Palmieri said. "Then you get a call kind of out of the blue and all of a sudden you're on the team. It was surprising, but at the same time I was thrilled to get that opportunity, and hopefully I can do my best to help our team try to win it."
Palmieri has strong ties to USA Hockey. He was part of USA Hockey's National Team Development Program and played for the United States at the IIHF World Junior Championship in 2010 in Saskatchewan and in 2011 in Buffalo, and at the 2012 IIHF World Championship in Finland and Sweden.
He said he expects the intensity at the World Cup to surpass those tournaments.
"If you look at it being in Toronto and this tournament not having anything that waters it down as far as countries that are a little less competitive at the NHL level, it's going to be a really hard tournament to win in a city where hockey is the No. 1 thing," he said. "So it's going to be pretty exciting to get up there and get the tournament started. I'll be able to draw off a couple experiences I had playing in World Juniors in Canada, and then again in Buffalo. I think it will be that on another level. But at the same time, I know how passionate U.S. and Canadian hockey fans are with international play."
Palmieri is even more excited about the Devils' chances this season. They were in contention for a Stanley Cup Playoff spot until going 9-14-1 in their final 24 games.
He said New Jersey is ready to take the next step this season because of some key additions, including forwards Taylor Hall, Vernon Fiddler and Beau Bennett, and defenseman Ben Lovejoy, plus promising prospects forward Pavel Zacha and defenseman Steven Santini. Acquiring Hall, who had 26 goals and 65 points last season, in a trade with the Edmonton Oilers for defenseman Adam Larsson should boost a team that was 30th in the NHL with an average of 2.22 goals per game.