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