The version that is still sung in the Canadian Army has a few variants:

General - not always mentioned but if he is he's in Paris at the Folies Bergeres

Colonel - dining with the Brigadier

Major - down in the deep dug-out

Captain - off on six weeks leave

Subaltern (or Louie) - out on a night patrol

Warrant - drinking up the company's rum

Sergeant - either drunk on the canteen floor or occasionally hanging on the old barbed wire

Private - holding up the whole damn line (rarely if ever hanging on the old barbed wire, as he is in most other versions)

I've always liked this version because it shows the subaltern and the private, the bottom of their respective military food chains, doing the actual work.