Why more CEOs and boards are worrying about security: 'The risk is everywhere.'

CEOs have long had corporate security in some settings. Yet now, some boards are taking steps, such as requiring execs to use corporate jets for personal travel, to minimize risks.

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• Some corporate boards are tightening security protocols amid growing concern over threats to executives.
• Major companies sometimes require CEOs to use company aircraft to reduce risk.
• One CEO has a protection detail of 18 armed agents, a security executive told Business Insider.