Leathernecks often say if it's not raining, they're not training.
The Marines will stay in their barracks for 14 days to prevent the spread of coronavirus at the start of their rotation.
The three American firefighters who were killed while helping to battle the wildfires in Australia have been identified.
The incident brought the death toll in Australia's bushfires to at least 32 since the crisis began in September.
A department of defense spokesperson was uncertain if the navy has ever shipped beer before.
At least 20 people have died, dozens are missing and more than 1,300 homes have been damaged.
Australia on Monday ruled out hosting ground-based U.S. missiles after talks with top defense and diplomatic officials.
The U.S. military's main role would be to provide "maritime domain awareness" to coalition partners in vulnerable waterways.
The exercise gives a glimpse into how the three countries could unite to defend contested islands in the Pacific.
The first Marines arrived in Darwin, Australia in 2012.