The most effective way to maintain acceptable levels of vigilance is to:

Systematically rotating duties between fixed posts and roving patrols helps maintain vigilance by reducing monotony and fatigue. It keeps security officers engaged and alert, ensuring better situational awareness and response capability. Random assignments or excessive non-security duties may detract from focus and operational efficiency.

ASIS Certified Protection Professional (CPP®) References:

Security Personnel Management: CPP materials highlight duty rotation as a key strategy for maintaining officer vigilance and morale.

Human Factors in Security: The role of structured rotations in reducing fatigue and enhancing alertness is emphasized in CPP training modules.