I take it you weren't in the Third Infantry Division. Only they are the Dog Face Soldiers, not the whole Army. And they say it with pride.
Just like Marines call themselves Jarheads with pride.
No, I never was in the Third anything. One of the ditties we used to sing on runs went something like this:
"Birdy birdy in the sky, Dropped a little whitewash in my eye. I'm no Doggy, I won't cry. I'm just glad that cows can't fly."
And I never had a Puerto Rican agent. Didn't know I needed one.