{HEAD ~ A drop vehicle} is positioned in the tube or {TAIL ~ tower} above the projectile so as to impact on the projectile when released and subjected to gravitational force 
is positioned in
{ HEAD ~ A drop vehicle } is positioned in the tube or { TAIL ~ tower } above the projectile so as to impact on the projectile when released and subjected to gravitational force
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH