MI10
MI10 , or Military Intelligence , section 10 , was a department of the British Directorate of Military Intelligence , part of the War Office . 
<triplet> MI10 <subj> Directorate of Military Intelligence <obj> applies to jurisdiction <triplet> Directorate of Military Intelligence <subj> War Office <obj> parent organization <triplet> War Office <subj> Directorate of Military Intelligence <obj> subsidiary