RHEL 6 32-bit system with 16 GB of memory shows less than 16 GB

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Issue

The server has 16 GB of memory installed, but will not show the full amount in RHEL 6 x86.
Example: running 'free' will show significantly less than 16 GB of free memory.

Environment

Red Hat Enterprise Linux 6 (RHEL 6)
32-bit processor(s)

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