"The depth of talent that exists in the national team programme is extraordinary," USA Basketball chairman Jerry Colangelo said in a statement.
"Repeating as gold medallists at the 2016 Olympics will not be easy, but we feel confident that we have 30 finalists who offer amazing basketball abilities and special versatility."
The only notable omission is two-times Olympic gold medallist Kobe Bryant, 37, who has already announced plans to retire.
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The official roster will be announced later this year.
The United States have won 14 of the 17 Olympic tournaments they have entered, including the last two with victories over Spain in the gold medal game.
(Reporting by Frank Pingue in Toronto. Editing by Steve Keating.)
