{TAIL ~ The spring} thus duplicates the force pulse acting on {HEAD ~ a fired projectile} and also allows for the drop vehicle to be reused 
{ TAIL ~ The spring } thus duplicates the force pulse acting on { HEAD ~ a fired projectile } and also allows for the drop vehicle to be reused
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH