Honestly I've never really ranked any songs from POM before. The trooper isn't in my top 3 from that album though, I'd say it's my 4th favorite track following #1.Still Life,#2.Flight of Icarus,#3.Revelations. Those are my top 3, and while I'm at it I guess I'll just rank all the songs from that album.
starting from 'The Trooper'
#4.The Trooper
#5.Where Eagles Dare (I would't want to shorten the song but I find the music section a bit to dragging IMO)
#6.Die with your boots on
#7.To Tame a Land
#8.Quest for Fire (above 'Sun and steel' because it's funner to sing, some great high notes that are not to dragging)
#9.Sun and Steel