He's a quick rehash of what the American military has been up to for the last 2 decades:
* Fighting a failing (read: failed) counter-insurgency, that has surely atrophied the necessary skills and experience of field-grade and above officers needed to fight great land and sea wars
* Mopping up the mess left from the above
I don't doubt the fighting ability of the line infantryman (I was one), but this idea that we could do anything about Hong Kong without engaging in a full-scale war is ludicrous. It ignores a) the actual military engagements this country has gotten into for the last 20 years, and b) the actual geo-political situation in the region. Perhaps consider what strategic interest to the United States Hong Kong represents before advocating that we get into yet another endless war with nebulous objectives and mystical thinking about how easy it would be.