A small group of trained people who form the basic unit of a military, political, or business organisation. (Cambridge Dictionary)
A small group of people specially trained for a particular purpose or profession. (Oxford Dictionaries)
A cadre is a small group of people who have been specially chosen, trained, and organised for a particular purpose. (Collins Dictionary)
A nucleus or core group especially of trained personnel able to assume control and to train others. (Merriam – Webster)
BCS cadre held for militant link.