service Law – Constitution of India, Art.136 – Post of BSF Sub-Inspector (GD) – Regular promotion criteria cannot be applied with regard to medical fitness in selection through LDCE – Post of BSF Sub-Inspector (GD) – Medically unfit – Promotion by selection through LDCE vis-à-vis competitive examination is a facility or a chance given for out of their promotion without waiting for the normal course of promotion – Is selection through competitive examination within the limited category of candidates – Cannot be equated with normal promotion – Regular promotion criteria can not be applied with regard to medical fitness even in the matter of selection through LDCE .