CSOs must be physically capable of performing all job-related functions, including: Frequent and prolonged walking, standing, sitting, and stooping for up to 12 hours per day, indoors or outdoors, in all weather conditions (heat, humidity, cold, rain, wind, sleet, and snow). Contractor personnel must successfully complete an approved physical evaluation demonstrating proper endurance, physical conditioning, proficiency in the use of firearms and security equipment, and the ability to tolerate physical exertion and sudden emotional stress.