Fallon's campaign, which comprises national press, outdoor and online activity, focuses on Qinetiq's security capabilities and how the issue of security extends beyond IT systems and virus software.
The press ads carry statements such as: "The nation looks to you for its security. Who do you look to?"
The campaign comes after research by Qinetiq revealed less than 50 per cent of companies are engaged in upgrading their security, despite three-quarters ranking security as being of primary concern.
The ads were written by Simon Roseblade and art directed by Glenn Gibbins.
Media planning and buying is handled by Manning Gottlieb OMD.
The ads, which break on Monday 26 April, with three executions in the Financial Times, will run until the end of June in broadsheet national press, online news and management websites and industry publications.