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.
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An expert answer on answers.com is the answer left for a particular question by an expert in the questions field.
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.
Yes, when referring to the medical field as a proper noun or specific entity, it is appropriate to capitalize it. For example, "She works in the Medical Field."
Steven gives it to you in Mossdeep City. You can use it in the field after you get the mind badge.