It is a corollary sport. From the MCPS website: "The goal of corollary sports is to increase interscholastic athletics participation opportunities for all students, in particular students with disabilities. An important goal of corollary teams is to achieve an approximately even ratio of participants with and without disabilities."
Whitman has a strong LFI program which means that their corollary teams tend to have more students with special needs. When we play schools with smaller numbers of students with disabilities and/or coaches who missed the memo on the point of corollary sports, it can be challenging and, frankly, a bit ugly. At Whitman the coach tried to pair one player with SN with a GenEd student for each match.
Whitman seems to be one of the schools that allows GenEd kids who play varsity sports (eg soccer or football) to also play on corollary teams. The handful of other schools that I'm familiar with do not allow this.