It's a good time to be in defence stocks in the US currently -- they've all outperformed the market: Lockheed Martin shares are up 8.4% since President Obama announced airstrikes against Islamic State militants in Iraq. Raytheon is up 8%. General Dynamics is up over 8%. Northrop Grumman is up 6%. The Dow's only up 4%; the Nasdaq 5.4%, the S&P 500 just 4.7%. All the companies' shares have hit historical highs this week. And rightly so: we're on the cusp of another major intervention in Iraq, and most likely in Syria as well, one that even Barack Obama says will be an extended effort.