I don’t think the military has its head in the sand on this. They know that PTSD is real. Effectively dealing with it is the problem.
In WW1 they called it “Shell Shock” and though it was studied the soldiers affected carried the stigma. By WW2 it was officially called “Combat Fatigue” and units were rotated “off the line” after a prescribed interval if the situation permitted. Notice that I said “units”.
In Iraq we see repeated deployments of from 9 months to a year. This is new. It approaches the WW2 situation, but without the physical mortality rate, so the mental injuries are far more apparent.
The military will be dealing with this for the foreseeable future.
I remember that Carlin routine, and he had a good point when he said, I’ll bet you if we’d of still been calling it “shell shock”, some of those Viet Nam veterans might have gotten the attention they needed at the time.