This was a well-loved song from the Boys Brigade song book, sung with great gusto at Batallion Camps. I know all the words. Here's the last verse:
But just one ray of chilly comfort has the orderly got
The when the rest have done their best, why he can finish the lot.
One cheering ray lights up the day when labour he would spurn,
That when he's played the scullery maid, the others can have their turn.
(bit sexist)
OH orderly orderly etc