 Complete the following phrase:  Halko started out in parasports at the age of seven after being approached at a farmers market by a member of the Greater Oklahoma Disabled Sports Association. She had never used a wheelchair prior, but uses one to race. Classified as a T34 athlete, she entered her first senior competition in 2015, competing at a Grand Prix in Mesa, Arizona. That same year Halko was chosen to represent the United States at the 