Reserved Med coys, I believe were just converted over to Fd Ambs. A ‘normal‘ Regular force Fd Amb (like there is such a thing) consists of Unit HQ, an Ambulance company, a Medical company, a dental platoon and a services company. Since Apr 01 all medic in a bde belong to Fd Amb, so in Pet they have whays called Intimate support medical company who man the UMS‘s.
For postings, Pet is a sure choice for those who want it, but beware. There is the medical tar pit for privates called 1 Cdn Fd Hospital, where they send keen young pte medics to rot under the oversupervision of evil nurses who have no real job or purpose but to keep the ptes counting canvass and heaters.
Fd Amb isn‘t much better because it heavy on the training, vehicle maintenance, and stores side, and weak on the medical side.
As for uniform color, it has abosolutely nothing to do with you job. Navy people in the field, Amry guys on ship...Uniform only really matters how comfortable you want to be marching to and from classes on your QL 3 and 5‘s. (GO ARMY)