law: Sashastra Seema Bal Act, 2007 
  8.  Resignation and withdrawal from the post.
  No member of the Force shall be at liberty,
  a.       To
  
  resign his appointment during the term of his engagement; or
  b.      To
  
  withdraw himself from all or any of the duties of his appointment, except with
  
  the previous permission in writing of the prescribed authority.