USPS Exam 421 Window Clerk Practice Exam-with 100% verified solutions-2026-2027 (10pages)

USPS Mission Provide, trusted, affordable, universal 24-Hour Clock Improve effectiveness through standardization & innovation. End-to-end process to ensure mail is Collected, distributed, and delivered. USPS runs on this. Delivery Methods Planes, trucks, cars, boats, bicycles, snow mobiles, mules. APC Automated Postal Centers Automated Postal Centers Self-serve kiosks, commercial retail outlets, banks, ATMs. Mail Arrival Profile Determines operational startup & staffing. CET Critical Entry Time Clearance Time Mail is cleared for dispatch. 18:00 Carriers in from street. 20:00 80% of collection mail should be cancelled at the P&DC. 23:00 Out of primary processing. 24:00