Comet Nucleus Dust and Organics Return (CONDOR), to retrieve a sample from 67P/Churyumov–Gerasimenko.[1][16] Comet Rendezvous, Sample Acquisition, Investigation, and Return (CORSAIR) would sample comet 88P/Howell.[15][17] Comet Astrobiology Exploration Sample Return (CAESAR) to comet 67P/Churyumov–Gerasimenko