The school has a long military tradition.
"We were born in 1889. We're 132 years old!" said Sister Johnellen Turner, principal of Saint Catherine's.
While the academy has military traditions, it is not a military school.
"We've taken things learned from the military and we call it 'kid-ify'. We take it and we put it in their words and their perspective," said Tyr May, a retired Marine Corps sergeant.
Representatives say Saint Catherine's Academy offers a well-rounded program with small class sizes and a diverse student body.
The students are also well known for their marching precision and are often seen in parades in Southern California.