Responsiveness of Artillery Fire. Because of the nature of the Vietnamese war and the large number of civilians living within areas where enemy contacts are initiated, there are certain mandatory clearances and checks that artillery units must obtain prior to a fire mission. In this particular case, the Daily Journal showed that the request for fire reached the artillery liaison officer's desk at the 1st Battalion, 50th Infantry Tactical Operation Center at 2040 hours. Clearance for a "trash grid" (the zone where the canister from an illumination round will impact) was obtained at 2051 hours.
This was from a situation report following an amubish at An Ke! 11 minute wait for illumination is 12 minutes too late! Sometimes it was 45 minutes before out OP got smoke rounds to adjust for HE fire.
I hope there not doing this 'stuff' in Iraq!
Thanx dante'

