Applications from external applicants will remain on file for 90 days. To extend your application beyond the 90 days you must come by the NAF Human Resources Office prior to the 90-day expiration. Applications from internal applicants will remain on file as long as you are employed. REG = Regular position. Scheduled to work between 20 and 40 hours per week and are eligible for life & health insurance, holiday pay, and annual & sick leave. Eligible for retirement and employer matching 401(k) savings plan. FLEX = Flexible position. Scheduled to work between 0 and 40 hours per week and not eligible for most benefits.