hallo,
United States visa is not required for citizens of United Kingdom for a stay up to 90 days.
it's true if you travel to the US on a tourist purpose.
http://united-states.visahq.com/requirements/United_Kingdom/
Yes, a return ticket is typically required for a US visitor visa to show that the visitor plans to leave the country before their visa expires.
There are no legal requirements to TOUR the UK. However, you may need an appropriate visa to ENTER the UK.
The maximum stay allowed for a US visitor visa is typically 6 months.
Nobody can work in the visa on a visitor visa. Short duration courses like cookery class that will not add any credits to a course can be attended using a visitor visa. But working in the US, that will enable you to draw salary is not allowed on a visitor visa.
Does not matter if you are a US Green Card holder or not, when you have an Australian visitor visa, you can go there.
The maximum length of stay allowed for a US visitor visa is typically 6 months.
A visitor visa holder can typically stay in the US for up to 6 months per visit.
The maximum duration of stay allowed for a US visitor visa holder is typically 6 months.
in the visitor's visa
There is no such thing as a Puerto Rican visa. Puerto Rico is part of the United States and if a visa is needed by a visitor it will be a US visa.
UK citizens can travel to several countries without a visa that require a visa for US citizens, including countries like Russia and Belarus. Additionally, some Caribbean nations, such as Dominica and Saint Kitts and Nevis, allow visa-free access to UK passport holders while imposing visa requirements on US passport holders. Always check the latest entry requirements before planning travel, as these can change frequently.
You'd be better off to obtain a visa which allowed you to seek employment in the US, so that you could establish permanent US residence, which is one of the requirements of a foreign volunteer to serve in the US armed forces (another being a declaration of intent to obtain US citizenship).