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