I would recommend you do it for the first year. Marching band is all about music and community of some of the finest citizens at your school. Rest assured that the people you meet already have a good sense of dicipline, a love of music, and have already taken many of the classes you will need to take. You will have friends before the school year begins and there is no measure for how much this will help as you enter an entirely new learning and social environment of the greater student body.