the insignias do not look "lawful" one bit!

What's that patch on his vest?

I think it's a variation of the tactical skull, sometimes seen for Airborne insignias, but most often just bought at Hot Topic to look cool. Same mindset as those who put Punisher skull logos on things without thinking once what Frank Castle actually would think of them.

Looks like a skull with a stake thru it

I'm thinking an arrow, with the arrowhead at the bottom. (But I haven't been able to find one like it, at least not with a few minutes on Google.)

Wow, he must be xtra bad-ass!