Milton-Freewater Oregon is a multicultural community located in the northeast corner of the state within ten miles of Walla Walla Washington. The Milton-Freewater Unified School District is now taking applications for the following position. Behavior Support Specialist (TOSA) - Gib Olinger. SUMMARY. The Teacher on Special Assignment (TOSA) – Behavior Support Specialist is responsible for providing comprehensive support in promoting positive behav...