@cody1984: CBR interview: "Steve and I went round and round on this, but ultimately, he wanted to make Frank younger because if he fought in Vietnam, he's in his 70s, and I get more mileage out of him being in his early 40s..."
You can choose to believe whatever you want.
Like I stated earlier to you in a pm
What he did was give the impression that Frank is no longer a Vietnam Veteran in the comic but didn't flat out state so. If Norah Winters stated "Frank Castle having served in Iraq came home to have his family murdered in front of his eyes" than yes that is a pure retcon. We didn't get that in the book though. We might get that later but for right now we haven't.