PALMDALE — Edwards Air Force Base officials are alerting the public to planned tests of an emergency alert system at Air Force Plant 42 in Palmdale on Friday.

The system, known as “Giant Voice,” is an outdoor warning siren system used to broadcast alerts, voice signals, music and tones during national, state, regional and local emergencies.

A similar system is in place at Edwards AFB, base officials said.

The testing will occur intermittently between 8 a.m. and 3 p.m. Friday, officials said.

It is not yet known what specific sounds will be part of the tests, whether it is sirens, voice commands or other means of alerting people at the facility.

No action will be required during the tests.

It is not yet known how far the Giant Voice sound will travel, so base officials wanted to alert the general public to the planned testing so that they are aware should they hear any of the tests of the emergency system.

Air Force Plant 42 is a government-owned facility under the supervision of Edwards Air Force Base and home to several defense companies, including Northrop Grumman and Lockheed Martin.

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