In commemoration of the 100th anniversary of World War 1, the UBA received authority from the BIPT for all Belgian Radio-amateurs to use the special OP prefix instead of the usual ON prefix, during the month of November 2015, 2016, 2017 & 2018.
In this connection the UBA is happy to remind you of the "UBA 14-18" award. The details can be found here.