Alva Review-Courier -

OKLAHOMA CITY (AP) — Security is not subtle at the sprawling campus of human resources technology giant Paycom in Oklahoma City.

Off-duty police officers roam the grounds, bolstering the company's own force of armed guards. A basement command center that looks like something out of a spy movie is filled with video screens showing feeds from hundreds of security cameras at company offices across the country.

While heavy security has become common at airports and stadiums to deter terrorism, extreme measures have been out of the ordinary at most companies eager to maintain a comfortable work env...