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Call blocking, also known as call block, call screening, or call rejection, allows a telephone subscriber to block incoming calls from specific telephone numbers. This feature may require an additional payment to the subscriber's telephone company or a third-party. Call blocking is desired by individuals who wish to block unwanted phone calls.
Orders to Sentry is the official title of a set of rules governing sentry (guard or watch) duty in the United States Armed Forces.While any guard posting has rules that may go without saying ("Stay awake," for instance), these orders are carefully detailed and particularly stressed in the U.S. Navy, U.S. Marine Corps, and U.S. Coast Guard.
Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...
A guardhouse (also known as a watch house, guard building, guard booth, guard shack, security booth, security building, or sentry building) is a building used to house personnel and security equipment.
Bartizan: a cylindrical turret or sentry post projecting beyond the parapet of a fort or castle; Bastion; Bastion fortress: a star-shaped fortress surrounding a town or city (also known as star fort or Trace italienne). Battery: an artillery position, which may be fortified. Berm; Blast wall: a barrier for protection from high explosive blast.
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The Boeing E-3 Sentry is an American airborne early warning and control (AEW&C) aircraft developed by Boeing. E-3s are commonly known as AWACS (Airborne Warning and Control System). Derived from the Boeing 707 airliner, it provides all-weather surveillance, command, control, and communications, and is used by the United States Air Force , NATO ...