Help please with RAF service release book B.O.B. Era

Living History

Hi can anyone help with regards to an Raf service release book dated from 20/8/40 to a corporal L Smith.

The reason for asking is that im not sure what his trade would have been, as under the (aircrew categoryand or Raf trade) it states Clk/Gd, of which i assume stands foir Clerk/General Duties.

But the part that i am unclear is after that it reads {M.C.} would anyone know what the (M.C.) stands for.

Many thanks for any help given as always.

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