WMG / Creedence Clearwater Revival

The lyrics of "Fortunate Son" from Willy and the Poor Boys pertain to multiple wars that America has been involved in and not just Vietnam in particular.

Let's break it down:
"Some folks are born made to wave the flag" - all
Ooh, they're red, white and blue - all
"And when the band plays 'Hail to the chief'" - since the Civil War
"Ooh, they'll point the cannon at you, Lord" - all, mainly up to the Civil War

"It ain't me, it ain't me / I ain't no senator's / millionaire's / military son, son / It ain't me, it ain't me / I ain't no fortunate one, no" - all

"Some folks are born silver spoon in hand" - all
"Lord, don't they help themselves, oh" - all
"But when the taxman comes to the door" - all, particularly the American Revolution
"Lord, the house looks like a rummage sale, yes" - all

"Some folks inherit star spangled eyes" - all since the War of 1812
"Ooh, they send you down to war, Lord" - all
"And when you ask them, 'How much should we give?'" - all
"Ooh, they'll only answer 'More! more! more!'" - all