He is the standard ex-military person who after being discharged has gotten into the Private Security Industry and become a gun for hire.
Agreed.
including:
I notice he's derisive towards anyone that's not helping him achieve his aims, and seems to have a different impression from others in a a few circumstances. I suggest that's a significant part of the issue.
There's also a significant lack of awareness and understanding here:
"All they have really done is be a paper tiger and crying crocodile tears and calling me to offer moral support. But I'm not a 10-year-old who's apparently lost their shoes, I want something done."