Jon calls this “ A nice bit of timeless satire from Kipling with a tune by Bellamy as usual. It’s interesting that so fervent an imperialist could be so scathing about idle class hypocrisy. He was nothing if not a complex character, as was Bellamy by the way.”
From Barrack Room Ballads and as you’d come to expect Mainly Norfolk has this one covered. I’ll ad the use of the name Tommy, short for Tommy Atkins as a generic term for a soldier is quite interesting and you can Wiki here. Typically not as straightforward as you might think, but the truth is in there somewhere.