Sentry

Sentry can refer to several different topics:

A sentry is a guard at a gate or other point of passage.
Sentry is an automatic near-Earth asteroid collision monitoring system.
Sentry is the codename of four unrelated fictional characters of the Marvel Universe.

:The most prominent of these is Robert Reynolds

Sentry Foods is a chain of grocery stores in Wisconsin.

The E-3D Sentry AWACS

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