The following instructions are not intended to apply to unique situations where free
fire zones have been established thru local Vietnamese officials, or to other unusual situations wherein free fire zones have been established in coordination with
commander of friendly forces.  Neither are the following instructions intended to
change or modify the MACV Rules of Engagement.

     1.  The challenge must always be effected on the assumption that the party being challenged is hostile.  Therefore, CSC must be kept appraised of what is taking place.  Likewise, the sentry must keep the challenged party under close security and
at a tactical disadvantage.

     2.  The command to halt must be executed in a voice loud enough to be heard
by the challenged party and in a language understood by the challenged party.  The
word for halt which is readily understood by all Vietnamese is “Dung Lai”, which is pronounced “Dung Lie”.  If the nationality of the challenged party is not known, use
both “Halt” and “Dung Lai”.  In an area of excessive noise, a whistle should also be
used in conjunction with the voice command.

     3.  If the challenged party does not heed the first command to halt, repeat the command in a loud clear voice.

     4.  If the challenged party does not heed the second command to halt, fire a
warning shot at a 70 degree angle over the head of the challenged party, followed by
a third command to halt.  In the event the individual fails to heel the warning shot and subsequent voice challenge, the sentry is authorized to fire to hit.  (Note:  The
procedure set forth above are not applicable when challenging persons who are off-base.  Persons who are off-base when challenged, will not be brought under fire for purposes of warning or otherwise, unless such persons are committing a hostile
act and fire is authorized in accordance with the MACV rules of Engagement).

     5.  Prohibited Practices.  Under no circumstances will a weapon be pointed at an individual(s) or fired into the air, merely as a bluff.  A bluff shot is defined as firing to frighten or dissuade under conditions where there is no intent or need to fire
with intent to hit.  The warning shot previously mentioned is not considered a bluff
shot, but is to insure that the individual is aware of being challenged.  The firing of a
bluff shot is misuse of a weapon and requires positive action by the commander
concerned in accordance with the provisions of paragraph 10, AFR 125-22.
Authorization and Use of Weapons, 12 October 1965.  In addition, the incident will
be reported in accordance with paragraph 12, Attachment 1, PACAF Regulation
125-3, Reports of Crimes and Serious Incidents, as supplemented.