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