Group 1 - The Australian government will invest 12 billion AUD (approximately 8 billion USD) to upgrade the Henderson shipyard in Western Australia, aiming to establish it as a maintenance center for nuclear submarines over the next 20 years [1] - The total expenditure for developing the Henderson submarine dock may reach 25 billion AUD (16.6 billion USD) [1] - Australia currently lacks the infrastructure to service nuclear submarines, prompting concerns about nuclear proliferation risks associated with the trilateral security partnership with the US and UK [1] Group 2 - Recent defense investment announcements from Australia include a 10 billion AUD (6.6 billion USD) purchase of 11 Japanese "Aegis" class frigates and an investment of 1.7 billion AUD (1.1 billion USD) to develop the "Ghost Shark" underwater drone fleet [2]