Log Category of Documents:
Directive #83/VP, dated 27 Feb 68, signed by Hong for the Command Committee, of A9, reveals that before dropping troops in a certain area or prior to the conduct of assaults against VC positions, FMF/RVF units used to move back 200-250m to have their formations marked with yellow smoke and allow arty, mort or aircraft strafe, bomb or fire chemical grenades into the VC defense positions.