Weatherhaven, a Vancouver, BC company, builds a variety of such shelter systems, and showed their newest one at the at the world’s largest defence and security show at London’s DSEi 2011.
http://www.marketwatch.com/story/weatherhaven-canadian-designed-hospital-and-command-posts-fit-inside-helicopters-to-add-new-dimension-for-nato-forces-2011-09-14
Designed to be carried inside a CH-47 Chinook, these innovative shelter systems can be deployed quickly where needed.
http://www.weatherhaven.com/about/news/sep_8_2011.asp
