Twelve years ago the Sinai Centre in the Netherlands started to treat ‘young veterans’, participating in post-Second World War UN and NATO missions. The implementation of this new treatment program was far from easy and many lessons were learned. The implementation had negative consequences: splitting among treatment staff, absence through illness, staff leaving, an ambivalent management and very difficult interactions between staff and veterans. In this paper we discuss the factors complicating a successful implementation of a treatment program for young veterans. Fortunately, in the end a successful treatment program was achieved. …