It used to be reserved solely for actual Combat Medics, with the MOS of 91B. However, with the Army reorganisation, 91B was folded into the 68W MOS (Healthcare Specialist), which is no longer limited to actual line medics. Anyone with the 68W MOS is elegible for the EFMB (and CMB). Technically, anyone with any MOS can go through the testing, but they cannot wear it without the 68 series MOS.
Expert Field Medical Badge was created in 1965.
The question makes it sound like a scenario where one decides to switch from the Regular (active) Army to the Army Reserve in the middle of their enlistment. This cannot be done - you can reenlist into a reserve component after your enlistment in the Regular Army is up, but you can't decide halfway through your enlistment that you want to switch your status to that of a reservist. On the matter of wearing an EIB, yes. You're entitled to wear any skill badges earned regardless of which component of the Army you're in. If you've earned the Expert Infantrymans Badge, Combat Infantrymans Badge, Expert Field Medic Badge, Combat Medic Badges, Combat Action Badge, jump wings, Air Assault wings, Pathfinder Badge, etc., then you're still entitled to wear them if you reenlist for a reserve component of the Army. Same thing with a Ranger tab.
An expert in his field is often called a specialist or an authority.
A license that qualifies someone to become a medical biller and coder. There are different training options for those who would like to specialize in this career. Some online courses are also available for those who are interested in this field.
An expert answer on answers.com is the answer left for a particular question by an expert in the questions field.
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why did you choose the medical field?
An expert or veteran in that field.
How computers helps in medical field?
All physicians must have a medical license to work as a doctor. However, a board certified physician has also passed rigid assessments making him an expert in a particular medical field.
An expert who provides opinions and advice in their field is typically referred to as a consultant or specialist.
Expert opinion is when in a professional field gives his/her opinion about a certain product.