The 21-year-old set American and Pan American records in the 100- and 400-meter freestyle at the U.S. Paralympic Team Swim Trials, held April 3-5 in Minneapolis.
Lamback, who has cerebral palsy, also set an American record in the 50-meter butterfly and was named the trials' top male swimmer.
"Making the U.S. Paralympics Swim Team is a once-in-a-lifetime opportunity," Lamback said in a press release.
"I look forward to representing my country at the Paralympic Games in Beijing and competing for the gold."
Lamback added to his race wins at the U.S. trials by winning the 50-meter freestyle. His times in all three freestyle events rank second internationally.
Lamback competes in the S7 division -- physically disabled swimmers are classified on a scale ranging from S1 with the most physical limitations to S10 for the most able-bodied swimmers.
Lamback, who won bronze medals in the 50- and 100-meter freestyle at the 2004 Paralympic Games in Athens, Greece, currently trains at the U.S. Olympic Training Center in Colorado Springs, Colo.
The Augusta swimmer began his career at the age of 14 as part of BlazeSports America's Georgia Blazer team. Lamback also has competed as a member of the Aiken-Augusta Swim League.