One thing is true for all military personnel no matter what their rank. They will eventually all leave the service. There is a formal process for turning in one's resignation. Below are some links to help guide you through the process.
Please note regardless of the type of scholarship there is an 8 year statutory service obligation. If you had a 4 year HPSP scholarship and served on active duty for 4 years you would still owe 4 years in a reserve component in accordance with 10 USC 651. This can be served on the inactive reserves.
