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The squad was made up of 23 men and 24 women, and led, once again, by the mercurial Michael Phelps, who qualified for his fourth Olympics.
Phelps qualified for five individual events which, with the addition of the three relays, would have seen him compete in the same events he won on Beijing four years ago.
But he dropped the 200 metres freestyle from his programme to save his energy for the relays, where the Americans face a huge challenge defending the 4x100m freestyle.
"The relays are always serious," head coach of the men's team Gregg Troy told reporters.
"That's a tough program Michael swims. It's really tough. He's a little bit older, and those older guys don't recover quite as quickly."
Colorado teenager Missy Franklin also qualified for seven events, including the relays. She is the first American female swimmer to do so and has already emerged as the new star of the women's team heading to her first Olympics.
"I think she's proven that she can handle the highest pressure with her performance here over the last week," women's head coach Teri McKeever said.
"She's 17-years-old, but she handled this meet like a seasoned professional."
Ryan Lochte qualified in five events and could add another in the relays. His rivalry with Phelps promises to be one of the highlights of the Olympics.
"We embrace that. It's good for the sport and it's good for the athletes," Troy added.
"But by the same token, those same fans, they need to understand there's some other guys in the world who are really good. I don't believe that Michael or Ryan have carte blanche that it's just the two of them."
The oldest member of the team was 36-year-old Jason Lezak, who qualified as a reserve in the 4x100m freestyle relay. The youngest was 15-year old Katie Ledecky, the winner of the 800m freestyle.
There was not a single world record set during the eight-day championship in the American Midwest but Troy said he was expecting all the swimmers would go faster in London.
"I'm concerned about everything. It's a pretty big world. There is a lot of good swimmers out there," he said.
"If we take anything lightly we're making mistakes. At the same time, we know where we are at. Our athletes are in a good spot.
"We have 21 great days planned for them. I think we're going to respond really well. It's competition, and we like to compete."
The selected swimmers will assemble in Tennessee next week for a training camp before heading to France to finish off their preparations before the Games start on July 27.
"I'm excited about how the women's team has unfolded," McKeever added.
"You know that the rest of the world is looking at how fast we're swimming and I think there are great possibilities to continue to get better."
The US swimming team for the London Olympics at the close of the US Olympic swimming trials on Monday, (note, any swimmer on the team can be selected for any relay):
Men
50m freestyle: Cullen Jones, Anthony Ervin
100m freestyle: Nathan Adrian, Cullen Jones
200m freestyle: Ryan Lochte, Ricky Berens
400m freestyle: Peter Vanderkaay, Conor Dwyer
1 500m freestyle: Andrew Gemmell, Connor Jaeger
100m backstroke: Matt Grevers, Nick Thoman
200m backstroke: Ryan Lochte, Tyler Clary
100m breaststroke: Brendan Hansen, Eric Shanteau
200m breaststroke: Scot Weltz, Clark Burckle
100m butterfly: Michael Phelps, Tyler McGill
200m butterfly: Michael Phelps, Tyler Clary
200m individual medley: Michael Phelps, Ryan Lochte
400m individual medley: Ryan Lochte, Michael Phelps
4x100m freestyle: Nathan Adrian, Cullen Jones, Matt Grevers, Ricky Berens, Jimmy Feigen, Jason Lezak
4x200m freestyle: Michael Phelps, Ryan Lochte, Ricky Berens, Conor Dwyer, Matt McLean Charlie Houchin, Davis Tarwater
4x100m medley relay: selected in London
Open Water: Alex Meyer
Women
50m freestyle: Jessica Hardy, Kara Lynn Joyce
100m freestyle: Jessica Hardy, Missy Franklin
200m freestyle: Allison Schmitt, Missy Franklin
400m freestyle: Allison Schmitt, Chloe Sutton
800m freestyle: Kathleen Ledecky, Kate Ziegler
100m backstroke: Missy Franklin, Rachel Bootsma
200m backstroke: Missy Fanklin, Elizabeth Beisel
100m breaststroke: Breeja Larson, Rebecca Soni
200m breaststroke: Rebecca Soni, Micah Lawrence
100m butterfly: Dana Vollmer, Claire Donahue
200m butterfly: Cammile Adams, Kathleen Hersey
200m individual medley: Caitlin Leverenz, Ariana Kukors
400m individual medley: Elizabeth Beisel, Caitlin Leverenz
4x100m freestyle: Jessica Hardy, Missy Franklin, Allison Schmitt, Lia Neal, Amanda Weir, Natalie Coughlin
4x200m freestyle: Allison Schmitt, Missy Franklin, Dana Vollmer, Lauren Perdue, Shannon Vreeland, Alyssa Anderson
4x100m medley relay: selected in London
Open water: Haley Anderson
Men’s head coach: Gregg Troy
Women's head coach: Teri McKeever
National team director: Frank Busch
