[4] Wanchoo belongs to the 1976 batch of the Indian Police Service from the West Bengal cadre.

[10] He was posted in the Intelligence Bureau when he was asked to join the Special Protection Group set up in 1985 after the assassination of Prime Minister Indira Gandhi.

He was transferred out in November 1997 but brought back to the SPG in February 1998 at Sonia Gandhi's request.

[12] Wanchoo was appointed Director of the SPG in 2004 for an initial two-year term[13] but continued in that post for seven years till his retirement on 31 October 2011.

[17] He was questioned by the Central Bureau of Investigation on 4 July 2014 as a witness in connection with the 2013 Indian helicopter bribery scandal.