If you are at a service academy at graduation you will be commissioned in the reserves as an O1. As an academy graduate you will not be required to attend officer indoctrination training. You will be free and clear until you graduate internship. Your HPSP service obligation will be tacked on to your obligation incurred from attending a service academy. For example the service obligation for a service academy is 5 years plus an additional 4 years for HPSP resulting in a total of 9 years of obligated service.