All sorts of simple analysis, pattern recognition stuff can feed this. Deliberate angle helps a lot. There is a lot of activity at this military base, take a look at it. If only a few activities can occur this is easier. Crime is invariably at or near the top of every poll of public concerns, and demographic trends suggest that the rate of crime will begin to rise soon after several years of decline.
People are willing to pay for security.
This is despite the fact that current systems are only marginally effective, and are extremely prone to false alarms. Corporate and government security needs are substantially larger, and these customers are willing to pay more for security in selected locations. Many of the tasks are tractable. These applications can provide a springboard to more difficult tasks such as detecting shoplifting. The costs are reasonable.