Commando (film)/WMG

John Matrix is an Agent.
The name is kind of a giveaway, but... bullets can't hurt him. The laws of physics mean nothing to him. And he really, really, doesn't want Sully to use that phone booth. Whether he's an Agent who's gone rogue after becoming attached to his "child" (a sub-programme he created from his own code), or Arius is really an earlier iteration of The One (with Bennett as his equivalent of Morpheus) remains unclear.

The T-800 models were designed to look like John Matrix
Skynet intentionally designed them to look like a soldier with a badass reputation in an attempt to make it easier for them to infiltrate the resistance. Seriously,if you were fighting a war against literal death-machines and a man with a reputation for overthrowing dictator's regimes shows up aren't you going to let him join in the fight?

John Matrix is the reincarnation ofConan of Cimmeria
Reincarnation was a heavy topic in the original Conan stories, and they look and act exactly the same. coincidence? I think not

Commando is set in the same universe as Die Hard
Val Verde exists in both movies. In fact, Die Hard was originally conceived as a sequel to Commando.