According to KSEE 24 News:
St. Timothy Catholic Church says that scouts won’t be allowed to meet or wear their uniforms on church property. The edict also applies to the adjacent St. Timothy School, which enrolls students from preschool to eighth grade.
NBC Washington reports why:
According to the Arlington Diocese, the pastor did not believe the National Girl Scouts membership to the World Association of Girl Guides & Girl Scouts aligned with the message of the church, stemming from a perceived connection between WAGGGS (World Association of Girl Guides and Girl Scouts) and Planned Parenthood.
The Girl Scouts statement in response:
"We are committed to ensuring that Girl Scouting is available to all girls from St. Timothy’s Catholic School, in Chantilly, VA," read a statement from the Girl Scout Council of the Nation's Capital. "This location change presents us with an opportunity to serve not only the girls from St. Timothy’s, but to invite more girls from the area to join Girl Scouts. After all, this is our 100th anniversary year and a great time to be part of Girl Scouting."