I agree with all of the above.
The song is either about all soldiers or, more specifically, about soldiers turned mercenaries ("Right becomes wrong").
The beginning of the intro reminds me a bit of South American folk tunes and instruments, so I always think of guerilleros (who sometimes fight for a better society and sometimes for drug lords) when I hear it, but of course that's only a personal interpretation and certainly not intended by Mark Knopfler.
I agree with all of the above. The song is either about all soldiers or, more specifically, about soldiers turned mercenaries ("Right becomes wrong"). The beginning of the intro reminds me a bit of South American folk tunes and instruments, so I always think of guerilleros (who sometimes fight for a better society and sometimes for drug lords) when I hear it, but of course that's only a personal interpretation and certainly not intended by Mark Knopfler.