I went to IFOD in Dallas as well, finished up about three weeks ago. I was in a two week class as I arrived with my written test completed and I have been an air traffic controller for 23 years.
I joined the final two weeks of the full 5 week class. There were several international students - two Saudis, two Indians, a Pakistani and a Mexican, and the staff there bent over backwards to insure their success.
One of the Saudis was a refugee from Sheffield, he'd been told, according to him, that he was "too stupid and he'd never pass the course" so he left after two weeks and was able to join up with the IFOD class. His English was a little rough, but he did just fine.
The IFOD website is
http://www.airlinedispatcher.com/
After calling around, I chose IFOD primarily because they told me they'd never canceled a class. That was a prime consideration for me, since I had to schedule things very tightly.