Other sound signals to warn of the imminent arrival or the presence of
biological or chemical hazards consist of a succession of short
signals, such as the following:
Rapid and continuous beating on any metal object or any other
object that produces a loud noise.
A succession of short blasts on a vehicle horn or other
A broken, warbling siren sound (for example, 10 seconds on, 10
seconds off, and so on).
Visual signals replace the sound alarms under conditions when
battlefield noises would drown out sound alarms or when the situation
does not permit the use of sound alarms. The standard hand-and-arm
signal for a chemical, biological, or radiological hazard consists of
putting on the protective mask, extending both arms horizontally
sideways with fists facing up, and rapidly moving the fists to the
head and back to the horizontal position, repeating as necessary.
If the commander chooses to designate a color-coded NBC warning
signal, the proper color is black. The commander must determine the
design of this warning device, but the unit SOP should cover its use
e. Actions When Not Warned of a CB Attack.
Knowing what to do is a critical factor in survival. When a chemical
or biological attack occurs, personnel protect themselves, warn their
unit, and take shelter as quickly as possible. An example of this
Stop breathing and put on your protective mask.
and check the mask.
Warn your unit.
You can do this by doing any of the
Hit metal objects together to make a loud, clanging
noise (Figure 1-5).