If you are in the Health Professions Scholarship Program (HPSP) or the Uniformed Services University of the Health Sciences (USUHS), or if you are receiving a stipend for Reserve or Guard service, you will fully focus on your medical studies. During this time, you will also receive valuable training that will serve you well no matter what career path you take.
The main difference between HPSP and USUHS is your status in relation to the Military. HPSP students are commissioned as officers in the Individual Ready Reserve, whereas USUHS students are active-duty officers, so they will spend more time in a military environment. Either way, medical students are expected to finish their training in the same amount of time as civilian students and will not be pulled away from medical training for deployments or similar military responsibilities.