CSMS # 68685200 - ACE Certification Standard Invasive Maintenance Window on May 20, 2026, from 5:00 p.m. to 8:00 p.m. ET U.S. Customs and Border Protection sent this bulletin at 05/19/2026 01:34 PM EDT Cargo Systems Messaging Service CSMS # 68685200 - ACE Certification Standard Invasive Maintenance Window on May 20, 2026, from 5:00 p.m. to 8:00 p.m. ET There will be an ACE certification (CERT) standard invasive maintenance window on Wednesday, May 20, 2026, from 5:00 p.m. to 8:00 p.m. ET.