Introduction
How is the Military in Australia and how does it work to maintain Sucity and fight terrorism? In terms of Military and security forces, we have the Australian Defense Force (ADF): Australian Army, Royal Australian Navy, Royal Australian Air Force (2024).
In Australia, Australia has been part of the Australia, New Zealand, and US Security (ANZUS) Treaty since 1951; Australia is also a member of the Five Powers Defense Arrangements (FPDA), a series of mutual assistance agreements reached in 1971 embracing Australia, Malaysia, New Zealand, Singapore, and the UK

Australia has long-standing bi-lateral defense and security ties to the UK, including defense and security cooperation treaties in 2024 and 2013; in 2020, Australia and the UK signed a memorandum of understanding to cooperate on the building of a next generation of frigates for their respective navies; the Australia-UK Ministerial Consultations (AUKMIN) is their premier bilateral forum on foreign policy, defense, and security issues 

Australia also has a long-standing military relationship with the US; Australian and US forces first fought together in France in 1918 and have fought together in every major US conflict since; Australia and the US signed an agreement in 2014 that allowed for closer bi-lateral defense and security cooperation, including rotations of US military forces and equipment to Australia; Australian military forces train often with US forces; Australia has Major Non-NATO Ally (MNNA) status with the US, a designation under US law that provides foreign partners with certain benefits in the areas of defense trade and security cooperation 

in 2021, Australia, the UK, and the US announced an enhanced trilateral security partnership called “AUKUS” which would build on existing bilateral ties, including deeper integration of defense and security-related science, technology, industrial bases, and supply chains, as well as deeper cooperation on a range of defense and security capabilities; the first initiative under AUKUS was a commitment to support Australia in acquiring conventionally armed nuclear-powered submarines for the Royal Australian Navy

the ADF's missions include protecting Australia’s borders and maritime interests, responding to domestic natural disasters, and deploying overseas for humanitarian, peacekeeping, and other security-related missions; it regularly participates in bi-lateral and multi-lateral exercises with foreign militaries; in 2024, it established a cyber command (2024)
Security and military information of Australia
Military and security service personnel strengths approximately 60,000 active troops (30,000 Army; 15,000 Navy; 15,000 Air Force) (2023)
Military equipment inventories and acquisitions the military's inventory includes a mix of domestically produced and imported Western weapons systems; in recent years, the US has been the largest supplier of arms; the Australian defense industry produces a variety of land and sea weapons platforms; the defense industry also participates in joint development and production ventures with other Western countries, including the US and Canada (2024)
Military service age and obligation 17 years of age (with parental consent) for voluntary military service for men and women; no conscription (abolished 1973) (2023). note 1: foreign nationals who are permanent residents, particularly New Zealanders, or those who have applied for citizenship or overseas candidates who have appropriate experience and qualifications from an overseas military can apply to join the ADF 

note 2: women have served in all roles, including combat arms, since 2013; in 2022, they comprised about 20% of the military
Military deployments note: the number of Australian military forces varies by mission; since the 1990s, Australia has deployed more than 30,000 personnel on nearly 100 UN peacekeeping and coalition military operations around the World.
Military expenditures
Military Expenditures 2023 2% of GDP (2023 est.)
Military Expenditures 2022 2% of GDP (2022)
Military Expenditures 2021 2.1% of GDP (2021)
Military Expenditures 2020 2.1% of GDP (2020)
Military Expenditures 2019 2% of GDP (2019)
Terrorism
In Australia, the different Terrorist group(s) inlcude: Islamic State of Iraq and ash-Sham (ISIS)
All Important Facts about Australia

Want to know more about Australia? Check all different factbooks for Australia below.

Australia is found in Australia and New Zealand