Security and Intelligence Division

The Security and Intelligence Division (SID) is the external intelligence agency of Singapore responsible for gathering and analysing intelligence related to the country's external security. Although it is within the Ministry of Defence, it has a certain independence in that it is not under the control of either of the Permanent Secretaries of Defence. It is also highly secretive as most of its personnel are known only to Singapore's top officials. 
The SID is led by a director, who holds the rank equivalent of Permanent Secretary and reports directly to the Prime Minister's Office (PMO). In the 1970s, the director reported directly to the Defence Minister. The SID had the post of deputy director, which was held by Lim Chye Heng in 1975.
History and activities.
The SID shared a similar background to its domestic counterpart, the Internal Security Department (ISD). In the aftermath of 1915 Singapore Mutiny, to collect the political intelligence, espionage, and the surveillance of potential subversives, a political intelligence bureau was established in Singapore under direct command and control of Major General Dudley Howard Ridout, General-Officer-Commanding (GOC) Singapore, which eventually became the Criminal Intelligence Department (Special Branch) in 1919. Before 1965, Singapore's primary intelligence agency was the Malaysian Special Branch. After Singapore gained independence in 1965, the Ministry of Interior and Defence was directed to reorganise and consolidate all intelligence capabilities in January 1966. The SID was subsequently established in February 1966, with Tay Seow Huah as its first Director. In 1974, S. R. Nathan, who was then the SID Director, led a negotiation team to help resolve the Laju hostage crisis.
As the SID is a highly secretive organisation, information about its activities is only released occasionally to the media. In 2001, Yap Chuin Wei, a reporter from "The Straits Times", interviewed a former SID officer on the agency's work. The officer, speaking on condition of anonymity, said that the SID works in three main ways: collection of information, analysis of information, and informal diplomacy. The SID was also mentioned in Lee Kuan Yew's book "From Third World to First: The Singapore Story: 1965-2000", in which it is said to have played a role in providing weapons to anti-communist forces in Cambodian Civil War in the 1970s. The SID also played a role in rebuilding Singapore's relations with Indonesia after the Konfrontasi ended in 1966. Tim Huxley wrote a short history of the SID in his book "Defending the Lion City: The Armed Forces of Singapore", which was published in 2000. 
The former SID officer interviewed by Yap said that SID officers rarely receive public awards due to security and political concerns. They are awarded a set of medals equivalent to the National Day medals instead but their names are not publicised.
In 2004, the National Security Coordination Secretariat (NSCS) was set up under the Prime Minister's Office (PMO) to deal with security threats and terrorism. This meant that the SID and the ISD, which previously worked independent of each other, had to share information for the first time.
In August 2013, it was alleged that the SID cooperated with the Australian Signals Directorate to tap the undersea fibre optic telecommunications cables that link Asia, Europe and the Middle East.
Directors.
The following is a list of known Directors of the SID.
In fiction.
The SID has occasionally been depicted in fiction. In an episode of the fictional television series, The Blacklist, the SID is mentioned amongst other well-known intelligence agencies including the CIA, KGB, and MI6 as having contracted out hits on its own agents who have since become "liabilities". The episode begins with a Chinese woman (presumably meant to be a SID agent) being covertly assassinated in what appears to be a shopping mall in Singapore.