Deletion of German Operations Research Society

Comment: per David's source finds and the independent sources in :de:Gesellschaft für Operations Research. Operations research is definitely a real field of study, although it used to be bigger than it is today. The independent source finds show marginal notability, and the fact that this is a bona fide national organization contributes to notability per 
Stance: keep
Cited policy: Wikipedia:Notability (WP:NGO)