The 2017 World League training roster is up on the FIVB website. Thomas Jaeschke and Jeff Jendryk are on this list. For each competition, I believe the team may dress 14 players.
http://worldleague.2017.fivb.com/en/gro ... eam_roster
On a side note, the men's national team will play Brazil twice locally at the Sears Centre in Hoffman Estates this August. Brazil is the 2016 Olympic Gold Medalist while the USA took Bronze.
http://www.teamusa.org/USA-Volleyball/F ... r-USAV-Cup