sentences:  This weekend course is highly rated and a lasting memory for many members.The national chief and the national vice chief are selected by a caucus of the section chiefs at the outset of the Order of the Arrow's national planning meeting.At the national level, the OA is headed by the National Order of the Arrow committee of which the national chief and national vice chief are voting members.The national adult leadership includes the volunteer national chairman and the OA director, a professional Scouter.