I think for the MU 616 punisher yes having served in the middle east in the early 90's suits the character better he is a more street level reality based character. The most so in the MU I think, So super serums etc don't work for me (sorry FRANKENCASTLE lovers )
The MAX Punisher will always be Nam based so as fans we will always have that....
And if u think for one minute that War and fighting it changes from war to war that's pure **** when your getting shot at by an AK 47 in a jungle in the 60's or a desert in the 90's it's still war it's still combat and it still ****s u up......
Except it is quite different. Very different.
In Vietnam, soldiers had to deal with not knowing who the enemy is, being ambushed by the enemy, were in a far more combative state, the United States was the aggressive power and the sides were morally grey, tens of thousands of American solders died, and there was no end in sight for the war.
With Iraq on the other hand, there were relatively few casualties, the United States was a liberating power and there was a clear bad guy (Saddam Hussein), the Iraqis were easily defeated and they weren't ambushing American soldiers, most troops didn't even see any combat, and American tanks essentially just rolled in, liberated Kuwait as heroes, and went straight back home.
To sum it all up:
BIG ****ING DIFFERENCE! The Persian Gulf War in the 90's just wouldn't give Frank the trauma that Vietnam created. Being ambushed by the Viet Cong is vastly different than rolling up in a tank to the Iraqis surrendering with barely a fight. Not knowing who your enemy is in Vietnam is vastly different than being greeted as a liberator for freeing a conquered nation. Not knowing if you're going to make it back home is vastly different than being bored in a base in Saudi Arabia. And yes, war does change. The ways to fight a war change all the time and it's constantly evolving. Combat tactics have changed, fighting styles have changed, the missions have changed. Everything has changed. If war didn't change, we'd still be lining up in straight lines like we did back in the Revolutionary War.
And honestly, it would make more sense to update the origins of the more realistic MAX Punisher as opposed to the 616 Punisher who lives in a world filled with gods, magicians, demons, mutants, aliens, etc. The 616 Punisher does not live in a realistic world, therefore it would make more sense to have him deal with unrealistic situations because that's the world he lives in. It just doesn't make any sense to put the realism filters on just one character in a universe that isn't realistic to begin with. Even Greg Rucka acknowledges that in his run on the Punisher.