pg 12, 1st paragraph under Star League
The role of mercs during Star League seems overly downplayed to me. It stood out to me because I recently read the 2765 Field Reports. I might suggest saying their roles were limited as Independent Defense Contractors or used in "Hidden Wars" for covert operations to have plausible deniability. The Northwind Highlanders, featured in this book, would fall under this category.
It is also stated in this paragraph that mercs did not own their own battlemechs because they were rare and expensive. I could think of a few reasons why mercs leased battlemechs instead of owning them, but saying it is because mechs are rare during the Star League is a reason I don't buy. I assume the primary reference for this comes from the intro to Field Manual: Mercs. However, FM:M said that merc battlemech commands were rare during the Star League, not battlemechs.
At any rate, I know this is suppose to only be a simple intro, but I ask you to take a second look at other sources, Field Manual: Mercs and Field Report 2765 (CC, FS, DC), to make sure you have the right, consistant description of mercs during the Star League.