Britain’s Government Communications Headquarters (GCHQ) in Cheltenham is seen in this undated handout aerial photograph released in London on October 18, 2010. Terrorism and cyber attacks are expected to take precedence over nuclear proliferation and the breakdown of weak states when the government reveals its strategy for national security on Monday. The government hopes the National Security Strategy will help to convince critics that a broad military review due out on Tuesday is based on strategic thinking, not just on the need to save money. REUTERS/Crown Copyright/Handout (BRITAIN – Tags: MILITARY POLITICS) NO COMMERCIAL OR BOOK SALES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO COMMERCIAL USE – RTXTJY3