The UK is due to continue the upgrade to its military satellite communications system with the launch of a new spacecraft on Friday.
The Skynet 5B platform will ride into orbit atop an Ariane 5 rocket from the Kourou spaceport, in French Guiana.
It will join the 5A satellite lofted successfully in March and which is already handling secure traffic for UK forces in Iraq and Afghanistan.
More: http://news.bbc.co.uk/2/hi/science/nature/7079876.stm