COMPLETED - What is a "fitter M.V" in Royal Armoured Corps?

[Nick The Duck]

Hello,

Please can someone tell me what the phrase "Fitter M.V." stands for.
Is M.V. an abbreviation for "motor vehicles" or perhaps "military vehicles" or something else? What would a fitter do?

I have attached my dad's AFB103 service record to show the original writing.

He was assigned to the 148th regiment, Royal Armoured Corps. Earlier, he had done some training as a driver/mechanic. On the 13th January 1943, it says he qualified as a "Fitter M.V., Gp A, Class III".
Also, what does "S.T.S" stand for?

O.C = Officer Commanding
D&M Wing = Driving and Maintenance Wing
AFV School = Armoured Fighting Vehicle School

What does "class III" relate to? Does it mean diesel engines?

Hope someone can help, please.

Nick The Duck

[themonsstar]

It could be Mechanical Vehicle, Fitter.

[Nick The Duck]

Thanks, themonsstar.

[Jean McGurn]

Class III is the grade attained next is Class II and then Class I.

Jean

[Nick The Duck]

Thanks Jean. So, if I understand you right, Class III is the top grade grouping, and Class I is the lowest?

[Jean McGurn]

Think it was other way round. Class III being the lowest class working upto Class I.

Jean

[Nick The Duck]

I wonder whether "Fitter M.V." is an abbreviation for a Military Vehicle Fitter? I suspect that my Dad was receiving training in repairing and maintaining all sort of military vehicles.