Who is Chacal?

[Gagadug.]

Dolfo sat in one of the many bars of Barrier Gate, sipping on his rum now and then. It had been a busy day in Liberty and he was ordered back to the Taus.
But not before he got some rest. Moving fighting units of the Legion was a far less organized process than it would have been in an actual military, the men and women got their next location and arrived when they could make it. Or not at all before they made some money for the fuel.
Now Dolfo didn't have this problem after the day he spent in Shikoku, he even had the cash to get himself a nice room on the gate and relax for a brief amount of time.
Thinking about more rum while sipping on the one he got he got bumped by some stranger.

You'd better go to the second floor, a man with your sign on the jacket started a brawl. Not so clever to start a fight here.

Dolfo nodded, stood up and hurried over to the stairs.
When he entered the second floor he saw nothing unusual at first, then he saw that the barkeeper sat on some chair while trying to stop his nose from bleeding. Some more people around him were fixing themselves up after what apparently was a brawl.
Once they saw Dolfo their looks turned quite hostile, one of them telling him to leave immediately. Legion pilots weren't welcome any more in this bar.
Dolfo asked where the other pilot went but surprisingly no one really knew.

While Dolfo searched for a new place to spend the night one question passed his mind again and again.
Who is Chacal?!
And why did he have to ruin this good evening?