I read that Indian army is adopting Linux. Find article by clicking link below
Only few months ago, president of India,DR. A. P. J. ABDUL KALAM, stressed to use open source for military purposes. No wonder official site of President of india ( http://presidentofindia.nic.in ) is running Linux. Check this at Netcraft (http://uptime.netcraft.com/up/graph/?host=www.presidentofindia.nic.in)
Cheers for the president !