TheCaptainJZ, on 20 November 2014 - 11:17 AM, said:
No. All mercs must be aligned with the Inner Sphere. The good news is, you are only limited to a house for the duration of your contract. The shortest contract length was going to be 1 month, but now it looks like it is going to be shorter. Check Paul's posts on Community Warfare under the Command Chair. Also, at the end of a contract, you can flip sides and not only swap houses, but swap to Clan allowing you to use your Clan Mechs only for the duration of that contract.
This is pretty much spot-on, but just to note: there are technically two different "Merc" factions - one for IS (Merc Corps), and one for Clans (Clan Loyalist).
Whichever one you choose, you'll have to accept a contract for one of the Houses (if you're an IS Merc Corp), or one of the Clans (if you opt for Clan Loyalist), and as the poster above me noted, your 'Mech choices will be limited to IS or Clan depending on which you choose.
Edited by DEMAX51, 20 November 2014 - 11:20 AM.