The National Team cycle is typically an 18 month process. For example, athletes looking to be on a 2026 National Team will begin the process in 2025. The athletes will need to be seen and recognized at 2025 events to be given an invite to the National Team Trials in the spring of 2026. Teams will then be selected to play in summer and fall events of that year.
More infromation can be found at https://int.usafootball.com/athletes-parents/how-to-be-on-the-national-team.