Closest I've been were the 20 on 20 drops between my myself (Clan Star Adder) and Hanson's Rough Riders back in Mechwarrior IV: Mercs, back when I was =CSA=Lucavi.
I miss those days...
If you wanted to join a "guild" (Clan), you had to prove your worth by fighting representatives of the clan (of course you didn't know which ones) in the ring of honor. Entry and rank was determined by how many you defeated. Fail to defeat one, and you fail to join. I honestly remember the sense of pride when getting my tags.