Just a tiny point, which MaJoC, in his erudition, might have picked up but didn't: it's "ad nauseam," not "ad nauseum," the latter being a common error. The Latin "ad" takes the accusative case, "nauseam," for the Latin noun "nausea."

As for Gunga Din (a fictional character, so never just "Din"), I completely agree with Howard's excellent post. Whilst I'm no fan of Kipling in general, I see the poem as a simple but on-the-money expression of thoughtful feelings and (possibly guilty) reflection, and several people are making the mistake of reading far too much into what they see as alleged racist and imperialist undercurrents. You might find that elsewhere in Kipling, but not in this poem.

Interestingly, Kipling regarded himself as persona non grata in the US, and, as a result, left the country. Worth a delve.