Galloway was nominated by upper school head and assistant head of school Victor Shin, who praised the senior for her leadership on and off the court.
"Kacie is an excellent student-athlete that is always encouraging and positive towards her teammates," Shine said.
Galloway faced a setback early this season when she suffered a sprained ankle, but she continued to come to practice to assist with drills and help her teammates.
"Her ability to lead is admirable even when she is faced with adversity," Shin said.
Under the guidance of head coach Missy Little, Maryvale is off to a 5-2 start this season, with a 4-1 mark in the IAAM B conference.
For Little, what stands out is Galloway's love of the sport.
"She does everything that she can to put everything that she has on the court," Little said. "And behind the court, she's always encouraging the other girls to do their best, and she herself does her best, always."
Galloway has also made an impact off the court, especially as the founder of Maryvale Prep's Operation Welcome Home Club, which organizes students to create signs and greet returning soldiers at BWI Airport to remind them how much their efforts are appreciated in the community.
Inspired in part by her brother's service in the Navy, Galloway said she thought it was a "great opportunity for me and a great opportunity to get the whole Maryvale community a part of it and helping, because I knew that they would want to do it as well."
Galloway will be attending Trine University in Angola, Ind., next year, where she will continue her volleyball career.
"Kacie is a hard worker, on and off the court," Shin said. "Her dedication to serving others is admirable. She will be dearly missed as she leaves for college."
Watch video of the award presentation: