{HEAD ~ a cylinder} and piston forming {TAIL ~ a chamber} mounted on a drop vehicle; and 
forming
{ HEAD ~ a cylinder } and piston forming { TAIL ~ a chamber } mounted on a drop vehicle ; and
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH