From the article:
"VA documents also show there are currently 184,520 veterans across the nation waiting longer than 30 days for an appointment and more than 45,000 new veteran patients waiting more than 90 days. Internal VA documents also indicate 479,239 veterans nationwide are waiting for physician requested follow-up appointments over 30 days for the period July to September 2017."
When Bernie Sanders and his legions start yelping for "single payer", this is the example that should be used as the counter-argument.
It should be pointed out to them that this is "the example" of an American single-payer healthcare system in action.
... Not that such an example will register with them, because of course it won't.
But it just might with enough rank-and-file Americans who will raise enough noise so that such a system won't be easily passed by Congress.