If I may offer an additional bit of math to add to the startling for some realization there has been an increase in disability applications. Since 911, approximately 4.4 million Americans participated in uniform in the Global War on Terrorism. The last time the military experienced such a surge of combat related employment of the armed forces was Vietnam. As you note the mid-seventies through 2001 was a different universe.
Secondly, medical science has advanced just a tad since the Second World War. The Agent Orange fiasco following the Vietnam War put a bright light on the potential risks of employing certain technology without fully understanding its effects. As a result, the VA has been far more proactive in determining certain environmental or location factors are presumptive of long term medical issues than in less informed decades. As Agent Orange also demonstrated, it is not only the right thing to do, but is also likely less expensive and socially divisive than battling class action suits by one's own veterans.
That, doing the right thing with respect for veterans, was also been behind the continuing effort by DOD to ensure that veterans' health issues were recognized and addressed. As you note, when I retired in 2003, no one was interested in my skin cancer, permanently perforated eardrum, or chronic breathing issues. By the time I applied for review two decades latter, repeated exposure to Middle Eastern sun, artillery concussion, and a pollutant rich atmosphere carried significant presumptive weight in an evaluation.
Finally, the existence of Veteran Support Officers in many states have been a Godsend to veterans trying to navigate the bureaucracy of the VA claims process. Applications that formerly were rejected on technicalities are now successfully adjudicated.
So yes,
@rookhawk , thankfully something else is finally going on, and you can not imagine how frustrating it is to a veteran to have someone with zero direct experience in the underlying issues pointing a finger and assuming fraud.