Registrars are comparable to Residents in the United States medical system; that is, at this stage of their medical career, both are undergoing specialty training. As aforementioned, Residents in the Australian medical system are doctors who have completed internship and undergoing additional years of general clinical rotations to gain further experience, prior to enrolling into a specialty training program. In the United States, choice of specialty is decided upon commencing Internship, such that clinical rotations and specialty training requirements are streamlined early on and flows straight on to Residency. There is no requirement in the United States for junior doctors to complete "pre-vocational/pre-specialist" training or experience general clinical rotations prior to specialty training enrolment; which is in contrast to Australian and other Commonwealth medical systems that choose to keep this traditional format in view that it ensures junior doctors receive holistic training and generalist exposure in various specialties of medicine before choosing a specialty to pursue.