Answer: The most common tones produced by sirens in the United States are "alert" (Steady) and "attack" (wail). ... Attack Warning – A 3 to 5 minute wavering tone on sirens or a series of short blasts on horns or other devices. The Attack Warning signal means detection of an actual attack or accidental missile launch. The sirens are usually for the people surrounding the area to let them know that they need to evacuate immediately.

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3 years ago

Which statement is true:

Roman55 [17]

B. Nixon resigned before he could be impeached, although he was very close.

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3 years ago

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Which of the following events helped lead to the end of the Japanese early periods and introduce the start of the Japanese Class

qwelly [4]