USPS Exam 421 Window Clerk Practice Exam Questions With Correct Answers | Latest Version 2025/2026 | Verified | Graded A+

USPS Exam 421 Window Clerk Practice Exam Questions With Correct Answers | Latest Version 2025/2026 | Verified | Graded A+ USPS Mission - answer-Provide, trusted, affordable, universal 24-Hour Clock - answer-Improve effectiveness through standardization & innovation. End-to-end process to ensure mail is Collected, distributed, and delivered. USPS runs on this. Delivery Methods - answer-Planes, trucks, cars, boats, bicycles, snow mobiles, mules. APC - answer-Automated Postal Centers Automated Postal Centers - answer-Self-serve kiosks, commercial retail outlets, banks, ATMs. Mail Arrival Profile - answer-Determines operational startup & staffing. CET - answer-Critical Entry Time Clearance Time - answer-Mail is cleared for dispatch. 18:00 - answer-Carriers in from street. 20:00 - answer-80% of collection mail should be cancelled at the P&DC.23:00 - answer-Out of primary processing. 24:00 - answer-Secondary Operations Complete 04:00-09:00 - answer-Distribute to DDC/DDU 07:00 - answer-100% of DPS 2nd pass complete. Core Responsibility - answer-Security, Sanctity, Preserve, Protect - Instills customer confidence, projects positive public image, maintains competitive advantage, protects privacy. PolicyNet - answer-Online resource to find handbooks, manuals, publications.