You must apply to the Veterans Legal Clinic, sending the application form (linked below) and a resume to Professor Alex Scherr, firstname.lastname@example.org. He will screen applications and may ask to interview you. You will receive notice about your application and, if invited, will be asked to confirm your interest before point allocation for the relevant semester.
The Veterans Legal Clinic is available in the spring, summer and fall semesters to (rising) 2L and 3L students. Students may repeat the clinic for more than one semester.