This is a Notable Operational milestone.
The Alouette III (SA 316B) formally left operational service with the Royal Netherlands Air Force in a ceremony held 15 Dec 2015.
The Alouette III had been in operational service with the force for over 50 years and flown nearly 400,000 hours, with some individual aircraft exceeding 10,000 hours.
Source: "Sud Aviation/Aérospatiale SA.316B Alouette III", Ken Bartie, 2018 AHS History Calendar