CALIPSO
CALIPSO is part of the "A Train" , flying in formation with several other satellites ( Aqua , Aura and CloudSat ) . 
<triplet> A Train <subj> Aqua <obj> has part <subj> Aura <obj> has part <triplet> Aqua <subj> A Train <obj> part of <triplet> Aura <subj> A Train <obj> part of