Also, make sure you change your phones to one with the proper GSM freq the rest of the world use. It may save your life.
And watch out for the occasional poisons spiders, snakes and jellyfish, killer stingray, sharks and crocs, as well as the rather harmless boxing kangaroo, emu that may poke its beak through your gut, koala that drops on your head and held tight with their claws, echidnas full of just sharp but not poisonous spikes, magpie and crows dive bomb and the occasional drunk with a sling shot, machete or some other form of street weapon.
Having 10-15K U.S. military and support personnel assigned to the base in Perth should would create a boom in the local economy.
I highly recommend any Aussie entrepreneurs begin exploring what it would take to import hard to find American comfort items, like; Tastykakes, Pork Roll, Famous Amos cookies, Sabrett Hot Dogs, bologna, scrapple, New York style deli meats, Krispy Kreme donuts...
A New Jersey and/or New York style deli outside any overseas military base would do very well, especially if you Aussies learned to make a real italian hoagie, cheesesteak, and thin crust tomato pie. If not a deli, then a Carolina/Texas style barbecue joint.
The aircraft carrier should also carry grey import computer hardware for the Australian market. The price on newegg are just not happening in Australia. It also helps the US economy (foreign money $_$ !!).