With regard to a potential nuclear attack, the attention or alert signal is usually a:
With regard to a potential nuclear attack, the attention or alert signal is usually a:
With regard to a potential nuclear attack, the attention or alert signal is usually a 30-second wavering sound on sirens. This type of signal is designed to attract immediate attention and prompt individuals to seek further information or take protective actions.
Duplicate with #493? Also, it should be 3-5 minute wavering, not steady.