2008 was just the beginning of a highly successful run of baseball teams for de Armas, the Phillies, and USA Baseball. In 2015, de Armas was called to the national stage once again, this time for the World Baseball Premier 12 tournament. The Americans would finish with the silver medal, falling to South Korea in the finals. Adam Frazier was named to the All-World Team as outfielder Matt McBride led the tournament with a .526 average.
In 2019, the Americans returned to the World Baseball Premier 12 tournament, and de Armas was again named to the coaching staff. The USA would finish in fourth but placed Brandon Dickson, Erik Kratz, Bobby Dalbec and Brent Rooker on the All-World Team.
The 2020 season became a blur for everyone involved in and around sports. With the COVID-19 pandemic affecting all aspects of life, the United States baseball team continued to put the final touches on an Olympic roster before participating in the Tokyo Olympic Games.