The Eagle Regiment is Chaminade's Marching Band and Color Guard, structured as a co-curricular class that meets both during the school day and after school. It is offered as a Fall Semester course, for which students receive a grade. Participants in the Eagle Regiment have the option to earn either 1 semester of Fine Arts Credit or 1 semester of Physical Education Credit each time they take the course. This flexibility allows students to tailor their credit accumulation to their academic needs. For example, a student who participates in the Eagle Regiment for all four years of high school could potentially earn a combination of 2 PE credits and 2 Fine Arts credits.