A modular spacecraft incorporating {HEAD ~ a launch vehicle interface design} that also functions as {TAIL ~ a berthing or docking interface} for the spacecraft 
functions as
A modular spacecraft incorporating { HEAD ~ a launch vehicle interface design } that also functions as { TAIL ~ a berthing or docking interface } for the spacecraft
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH