Looking For A Poem

I'm trying to find a poem I learned in school in the 80's. It's a poem about sending young men to war. I don't recall the title or author.

If I were old and full of grace
I'd live with Sargent majors at the base
You'd see me with my puffy petulant face
Guzzling and gulping in the best hotels

This is how I recall some of it. Hope someone out there can help. Thanks