This song is always on war films, its a full metal jacket style film song.
The main chorus goes:
ONE da daa, TWO da daa and then there is a little link line here, I think it was something like 'come dance with me now' or something to that length before it goes back to the start.
The da da bits are either brass instruments going ba baaa or I think there is another version with a group of men or something going hu huu. the dadaa after ONE is a note C and the da daa after two is about an E if I remember correctly.
Thats all I can remember really. Its not a common song, but eveyone has heard it and usualy remembers the ONE! TWO! bit.
Enjoy...