Around 1995 I played one BT MUSE as Liao MechWarrior Frabartolo, but can't recall which MUSE it was. I think it was the BattleTech 3056 MUSE, but I may be wrong.
I eventually dropped out because my university uplink was too slow for the realtime combat simluator, leaving my 'Mech a sitting duck in the training exercises, and thus preventing me from ever partaking in any serious battles.
My notable exploits during the time on the MUSE included losing 3 Griffins in a row in ill-fated attempts to prove the design's superiority on the battlefield, later faring surprisingly well piloting a Crusader (a design I don't like) and eventually getting assigned a Cataphract, but never the Archer I always asked for. Despite merely mediocre combat performance (or perhaps because this was still better than than the average Liao MechWarrior) I was promoted to Subcommander, drafted into Warrior House Imarra against my wishes and given command of a Lance that had never seen combat action by the time I had to quit the game.
Ah, good times. :)