I’ve always assumed this to be fiction, but does anyone know if the rap in Dirty Harry is written by someone with actual combat experience?

At night I hear the shots
Ring so I’m a light sleeper
The cost of life,
it seems to get cheaper
out in the desert
with my street sweeper
The war is over
So said the speaker with the flight suit on
Maybe to him I’m just a pawn
So he can advance
Remember when I used to dance
Man, all I want to do is dance

Like I said, I think it’s fiction, but it’s not unimaginable to me that it would be written by someone over there…