Whether HCMS doctors can be drafted in General Election duty?

The Chief Electoral Officer w.r.t. the election duty of HCMS doctors clearly says, "Whenever the HCMS doctors are drafted in election duty it may be ensured that medical facilities for public may not suffer". (click to view letter)

It is also mentioned in Handbook of Returning Officer 2014 (chapter III, point 3.3.1, Exempted categories) that the Commission has exempted the medical staff including doctors, nurses, ANM etc in view of their essential nature of duty/service discharged by them. (Abstract from handbook for Returning Officer 2014)