A Canadian medical "orderly" won a V.C. during the war:
"Corporal Topham was serving as a medical orderly in the 1st Canadian Parachute Battalion.":
http://www.cmp-cpm.forces.gc.ca/dhh-dhp/gal/vcg-gcv/bio/topham-fg-eng.asp
His V.C. reads, "On 24th March, 1945, Corporal Topham, a medical orderly, parachuted with his Battalion on to a strongly defended area east of the Rhine.":
http://en.wikipedia.org/wiki/Frederick_George_Topham#Details
Everything I have ever read about Cpl. Topham describes him as a "Medical Orderly".
If I recall correctly, when I enrolled the term was "Medical Assistant", and later "Medical Technician".