Are the "Guests" character Mechs indestructible?

I just played a mission with Kamea and

her Atlas mech. The mission where you try to get Lord Madeira back from the Taurians.

The mech ended up losing its arms and the right torso.

Will that mech be brand new, with its standard weapon if I ever get Kamea as a guest pilot in that mech? That is, if there's another mission she will join with that Mech.

Solution 1:

Yes, guest mechs are indestructible. They will return in future missions.

Minor spoiler:

At certain points in the story campaign you will be rewarded with special mechs. They appear on the battlefield earlier but even if they are destroyed or damaged there they will be give to you intact, including any special weaponry.

Bigger spoiler:

You will get a special highlander with unique weapons after raiding the SLDF citadel and after completing the story campaign you willl get Kamea's Atlas.