Australian soldiers are to be banned from using slang around United States soldiers because a misunderstanding could be fatal.

As a record number of American troops arrives in Darwin for a joint training rotation, commanders have said Aussie slang will need to be toned down.

'We have lost in translation moments more than you would realise,' Air Force Group Captain Stewart Dowrie told 10 News.

Australian soldiers are to be banned from using slang around United States soldiers

'The time to figure that out is not on the battle field when the bullets are flying,' he said.

'Classic phrase 'lucked out' - for some people it means you get lucky, for others it didn't happen. So you start using colloquialisms and all of a sudden you have complete misunderstandings about whether something is going to happen.'

During the last two weeks 1700 marines landed in the Norther Territory, with the number to eventually reach 2500.

The troops will practice high-end war fighting activities with Australian soldiers.

Officials have said the opportunities to train together are invaluable towards sharing knowledge.