It will be his first career appearance on the U.S. men's national team and third time representing his country in world-championship play, most recently winning a bronze medal at the 2016 World Juniors. He scored two goals and added six assists in seven games during that tournament.
Schmaltz just completed his first professional season with the Blackhawks, where he tallied six goals and 22 assists in 61 games.
After the year ended, he spoke about the possibility of playing for USA in this tournament and what it would mean to him.
"I think it's a great tournament," Schmaltz said. "You get to play with a lot of great players. Look like a lot of great players are going to the tournament, so it's definitely a big stage. It would be a fun tournament."
The roster now includes 13 forwards, seven defensemen and three goaltenders. Among the other NHLers going for the Americans: Danny DeKeyser, Noah Hanifin, Jimmy Howard, Dylan Larkin, Anders Lee, Charlie McAvoy, Connor Murphy, Brock Nelson and Jacob Trouba.
Blackhawks forwards Marcus Kruger (Sweden) and Artemi Panarin (Russia) will also compete in the tournament, which begins May 5 and runs until May 21 in Cologne, Germany and Paris, France.