pardon me if this is an ignorant question, but since i wasn't born deaf, i don't know the answer. how is someone supposed to communicate with other guards if they can't read lips? i don't think writing with pen and paper will be very efficient especially if a situation requires immediate attention
.
In large complexes, this could be a firm such as an electronics manufacturer, huge NYC mall, even apartment buildings, airports, etc. There is usually one person who sits behind a bank of monitors. The monitors are connected to cameras that cover areas from say 10' to 50' areas.
This persons job is to watch the monitors and spot any inappropriate activity, such as shop lifting, purse snatching, a man adjusting a pistol in his belt, someone appearing to follow a child, someone approaching another in a threatening manner. When something suspicious occurs this person's job is to inform the guards on the floor who are wearing earpieces as to what is going on, where it is going on, what the participants are wearing, etc.
In the movies where the pace needs to be kept up the floor guards will be asking the monitor person stupid, distracting questions such as, "Which way did he go?" In real life if the monitor watcher is doing their job they will be telling the floor guard -- If only the guard will shut up long enough to listen.
So in order to do this monitor watcher's job you need to see clearly, quickly, and understand what you are observing, be able to push buttons, and be able to speak clearly.
I've met people born deaf who could do that -- With their hands tied behind their back.