Gaining permanent control of a Chryssalid/Tentaculat

This one is pretty easy,

in ufo find a zombie(a civilian or one of your men) in tftd find a weak aquanaut you dont need and make him become a zombie with a tentaculat. then mc the zombie and shoot it. the tentaculat/chrysallid is hostile however dont kill it... next turns its yours... and will be yours for the rest of the mission.

my suggestion for tftd is to give it a heavy thermal lance... then it can be useful even against lobstermen.