I have an original RCA-Victor 45 of it as well. I've just done a Google search on Sgt. Barry Sadler, and what do you know? The first site I came to actually has the recording online! Turn on your sound and give it a little while to download: http://www.brownielocks.com/balladofthegreenberetsWAVE.html
If I'm singing,it's usually an Old Country song. Usually something Hank Sr. sang.
Ah, I'm with you on that Russell. I love the old-style country.