There were no orders to do that.
The people that did it went to jail, except for the guy who tried to hang himself and brain-damaged himself so badly that he is to all intents and purposes a toddler.
The colonel in charge of the regiment was cashiered for the obvious and terrible breakdown in discipline in his regiment.
The regiment itself was disbanded; despite it's storied history, the murder of Arone was considered such a vile and ignominious act and indicative of an absolute breakdown of discipline that the only solution was to destroy the regiment and break up the people in it.
It'd be nice if the person you quote provided a link to the report, and named the people who called it incomplete and inadequate.
Here's some more info about that:
http://hrsbstaff.edn...omalia_affair.htm
http://epe.lac-bac.g.../issue-2/0244.htm
http://epe.lac-bac.g.../issue-2/0244.htm
Wikipedia has a pretty good overview of all that:
http://en.wikipedia....ki/Somalia_Affair