Aut cum scuto aut in scuto
I worked with the ROK Navy, Squadron 56, and they are a very tough bunch. The Koreans view their military as professional killers - with proper justification. In the US, the selection process is a lot less demanding for many military roles.
I've been to the DMV. It's a serious place. Other than the threat of nukes, I don't believe the North Koreans have been able to afford to modernize its military like this. This video was obviously meant for Kim Jong Un's viewing. Suck it, fat boy.