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1965

10 March - MacDonald House bombing by Indonesian saboteurs killed 3 people, during the konfrontasi period.

1974

• 31 January - Laju incident

1984

• Concept of Total Defence is introduced.
• The Singapore Special Operations Force (SOF) is formed in secret.

1990

• May - The elite Disaster Assistance and Rescue Team (DART) is formed

1991

• 26 March - Four Pakistanis hijack Singapore Airlines Flight 117 and demand the release of Pakistan Peoples Party members from Pakistani jails.
• 27 March - Members of the Singapore Special Operations Force storm Singapore Airlines Flight 117, killing all hijackers and freeing all passengers and crew members.

1992

• 10 September - Special Operations Command (SOC) is formed, combining the Police Tactical Team (PTT), Police Tactical Unit (PTU) and Police Dog Unit under one wing.

2001

• 9 December - 15 militants of Jemaah Islamiyah are arrested for the Singapore embassies attack plot

2002

• August - Singapore arrests another 21 members of Jemaah Islamiyah.
• 12 October - Bali car bombing by Jemaah Islamiah kills 202 people in the Indonesian island.

2003

• 17 January - Chemical, Biological, Radiological and Explosive Defence Group conducts Exercise Diamond Shield to demonstrate chemical and biological defence capability.
• March - Chemical Verification Laboratory is certified by Organisation for the Prohibition of Chemical Weapons (OPCW) as a designated laboratory for the testing of chemical warfare agents
• 14 August - Air Marshal Unit is formed to counter terrorism threats against civil aviation
• 1 October - The first Special Rescue Battalion of the Singapore Civil Defence Force is formed

2004

• 21 March - Malaysian Prime Minister Abdullah Ahmad Badawi leads UMNO to a resounding victory in the General Elections, checking the advance of Islamic Party of Malaysia (PAS) that aims to establish Malaysia as an Islamist theocratic country.
• 6 May - Prime Minister Goh Chok Tong delivers a speech at the Council on Foreign Relations in Washington, D.C. titled "Beyond Madrid: Winning Against Terrorism".

2005

• 15 August - The newly established Police MRT Unit begins operational patrols on the Mass Rapid Transit network to enhance the security of Singapore's public transport
• 15 August - Singapore hosts a multi-national maritime interdiction exercise, codename Exercise Deep Sabre as part of the Proliferation Security Initiative.
• 25 August - French investigating magistrate Jean-Louis Bruguière singles out Singapore along with Tokyo and Sydney as potential terrorism targets of the Al-Qaeda. Ministry of Home Affairs later denied receiving any specific information on imminent terrorist threat.
• 21 November - 25 - Singapore hosts the Regional Special Forces Counter-Terrorism Conference.

2006

• 8 January - Exercise Northstar V, a large scale civil defence exercise, is held in Singapore.