My take –
The Vietnam memorial has over 58,000 KIAs/MIAs on "The Wall". Many believe that number is really is closer to being way over 60,000.
Of course, those numbers don't include all those maimed for life both physically and mentally plus suicides, ODs, etc. Which if added in would be probably about 3x or more the KIAs/MIAs.
So total KIA/WIA/MIA would probably much closer to round 18-20,000(?).
And yes, many in Vietnam were drafted. But many were not. As the war dragged on more & more units were full of draftees. E.g. sometimes only the Plt Ldr and P/SGT were not drafted by the early '70s. I am not berating draftees. The vast majority did their duty and many case above and beyond. I know many Vietnam Vets … talk to them often and Vet functions etc. Whether volunteered or drafted. They did their duty. As a young LT in the 101 in the early '80s. Many of the senior NCOs and Officers had served in SE Asia.
No draft was one key difference from Vietnam vs. the GWOT.
Also the US mainland was targeted by islamic terrorists. And targeted US citizens overseas as well. The US was not in fear of VC or NCA attacking US citizens in America.
However, islamists' primary targets were/are non-combatants.
The numbers KIA'd in the GWOT is "only" around 7000, + or – … However, the WIA'd/maimed for life plus suicides, etc. during that war would be also 2 or 3x that.
Modern improved medical tech also saved many US/Coalitions lives during the GWOT. That would have probably died in e.g. Vietnam.
However, I think that the withdrawal/fall of Kabul/A'stan was more humiliating. And could have been handled much better hand … Or not needed at all.