Coppell High School Drill Team The Lariette Service Organization (LSO) exists to support the Coppell High School Lariette Drill Team and its Director by encouraging the development of the teams dance skills and their school and community responsibilities. The LSO supports the Lariettes by means of fundraisers, chaperones, attendance at dance events, but most of all by being the role models for our daughters to become productive and positive students, citizens and Lariette team members.