The Inter-university Institute for High Energies or IIHE combines in Belgium the particle physicists from the Université Libre de Bruxelles (ULB) and the Vrije Universiteit Brussel (VUB). On 22 November 2017, with many of our CMS members in the picture, we celebrated the 25th anniversary of CMS. As a founding member, and after years of commitment to the experiment, we warmly thank our CMS colleagues worldwide for the wonderful collaboration!