Imminent Air Attack.
1. Unbroken warbling siren for one minute duration.
square in shape
2. Succession of long blasts on vehicle horns, whistles, bugles
or other wind instruments in a ratio of 3 to 1; about three
seconds on and one second off.
3. Vocal "Air Attack" or corresponding national term when
one nation is involved.
All Clear, Removal
1. Vocal "All Clear Air Attack" or corresponding national
term when only one nation is involved.
2. Steady siren note for one minute or sustained blast on a
vehicle horn, whistle, bugle, or other instrument to indicate
absence of all NBC and air attack hazards.
Table 1. Emergency Air Attack Alarms (NATO)
The actual form of a visual signal and method of display are left to the discretion of the local
commander. Only the "red" visual warning in Table 1 is mandatory. Include your air attack
warning system in your unit tactical standing operating procedures (TSOP).
The hand and arm signal for air threat is shown in figure 12.
Figure 12. Hand and Arm Signal for Air Threat