Welcome to Just Answer and thanks for your question. The Health Professions Educational Acit of 1976 and subsequent legislation funneled federal monies to medical schools to promote more trained medical professionals for primary care medicine and dentistry, and specifically for underserved areas. It isn't something you "sign up for." The schools used the money to expand their primary healthcare education programs, which included building structures, hiring more faculty and making some grants to students most in need of financial assistance. One has to contact each medical school's financial aid office to find out what assistance they may be eligible for. There are many different types of aids and loans available, but each school's financial aid officer would be the person to contact in every case.