By the way, is there anyone can explain why a special ops ever needs for a battlemech in the first place? It is nothing different with a Delta Force tank company. The strength of special ops is more like cloak and dagger than the line unit(although it is not actually similar with cloak and dagger), so using armored unit other than battle armor and vtol(transport) is not an option I think.
SpecOps isn't all skulking in alleys or freeing hostages from an embassy in the Btech world. There are numerous missions from the fluff where mech units were sent on important but secret missions; missions too sensitive to trust to "deniable" mercenary hires.
The fiction in one of the sourcebooks gave me the idea: it was about a line company sent by Davion Intelligence on a black operation to kill a former Davion officer who diverted materials from another black operation to set himself up as a Periphery Warlord after he was cashiered from the AFFS. The Davies had been secretly arming anti-Kurita forces on a Periphery world near thier border and the Colonel involved has squirreled away mechs, weapons, and supplies, instead of arming the locals. When he gets the boot for his incompetence, he heads for the Periphery and sets up shop as a despot. So MI sends in one of his old regiment (who was also involved in the first naughty mission!) to quietly dispose of him and his new "command".
Another details a series of "pirate" raids hitting questionable targets (civilian infrastructure) to draw Cappie forces away from a strategic factory facility. Mercs couldnt be trusted to pull off what would be an illegal mission, so a house unit with unquestioned loyalty was sent by MI.
I can see lots of missions were everything from a young woman in a tight dress with a poisoned hairpin to a squad of stealth battle armor to a company of disguised battlemechs could all have thier time and place! :)
I just needed info on any units in the fluff dedicated to these kinds of jobs in AFFS.