Several of the scientists I know personally are headed over to the US this week, these are people who worked on several oil spills in Australia, including the spill in Bass Strait in 1995 and the recent spill, and continued leakage, off the coast of Western Australia, last year. These are scientists who are not 'owned' by any oil companies.
There are also 2 scientists from the Netherlands and 3 from Germany, that also worked to stop the oil leak last year, heading to the US.
What makes me wonder, is why it has taken this long for the US government to ask for outside help, particularly when experienced people offered to help several weeks ago. This is something worth investigating.