 In 2001, Callinan was promoted to chief superintendent and was later appointed as Assistant Commissioner of the National Support Services in 2005.The NSS has under its jurisdiction the National Bureau of Criminal Investigation, Garda National Drugs Unit, the Bureau of Fraud Investigation and the Criminal Assets Bureau.Callinan was further promoted in January 2007, by his friend and Garda Commissioner, Noel Conroy, to the position of Deputy Commissioner.